Update generated code: List responses return empty list instead of null

google-cloud-clients/google-cloud-automl/src/main/java/com/google/cloud/automl/v1beta1/stub/AutoMlStubSettings.java

@@ -371,7 +371,9 @@ public String extractNextToken(ListDatasetsResponse payload) {
 
             @Override
             public Iterable<Dataset> extractResources(ListDatasetsResponse payload) {
-              return payload.getDatasetsList();
+              return payload.getDatasetsList() != null
+                  ? payload.getDatasetsList()
+                  : ImmutableList.<Dataset>of();
             }
           };
 
@@ -405,7 +407,9 @@ public String extractNextToken(ListModelsResponse payload) {
 
             @Override
             public Iterable<Model> extractResources(ListModelsResponse payload) {
-              return payload.getModelList();
+              return payload.getModelList() != null
+                  ? payload.getModelList()
+                  : ImmutableList.<Model>of();
             }
           };
 
@@ -444,7 +448,9 @@ public String extractNextToken(ListModelEvaluationsResponse payload) {
             @Override
             public Iterable<ModelEvaluation> extractResources(
                 ListModelEvaluationsResponse payload) {
-              return payload.getModelEvaluationList();
+              return payload.getModelEvaluationList() != null
+                  ? payload.getModelEvaluationList()
+                  : ImmutableList.<ModelEvaluation>of();
             }
           };
 

google-cloud-clients/google-cloud-bigquerydatatransfer/src/main/java/com/google/cloud/bigquery/datatransfer/v1/stub/DataTransferServiceStubSettings.java

@@ -329,7 +329,9 @@ public String extractNextToken(ListDataSourcesResponse payload) {
 
             @Override
             public Iterable<DataSource> extractResources(ListDataSourcesResponse payload) {
-              return payload.getDataSourcesList();
+              return payload.getDataSourcesList() != null
+                  ? payload.getDataSourcesList()
+                  : ImmutableList.<DataSource>of();
             }
           };
 
@@ -367,7 +369,9 @@ public String extractNextToken(ListTransferConfigsResponse payload) {
 
             @Override
             public Iterable<TransferConfig> extractResources(ListTransferConfigsResponse payload) {
-              return payload.getTransferConfigsList();
+              return payload.getTransferConfigsList() != null
+                  ? payload.getTransferConfigsList()
+                  : ImmutableList.<TransferConfig>of();
             }
           };
 
@@ -405,7 +409,9 @@ public String extractNextToken(ListTransferRunsResponse payload) {
 
             @Override
             public Iterable<TransferRun> extractResources(ListTransferRunsResponse payload) {
-              return payload.getTransferRunsList();
+              return payload.getTransferRunsList() != null
+                  ? payload.getTransferRunsList()
+                  : ImmutableList.<TransferRun>of();
             }
           };
 
@@ -443,7 +449,9 @@ public String extractNextToken(ListTransferLogsResponse payload) {
 
             @Override
             public Iterable<TransferMessage> extractResources(ListTransferLogsResponse payload) {
-              return payload.getTransferMessagesList();
+              return payload.getTransferMessagesList() != null
+                  ? payload.getTransferMessagesList()
+                  : ImmutableList.<TransferMessage>of();
             }
           };
 

google-cloud-clients/google-cloud-bigtable-admin/src/main/java/com/google/cloud/bigtable/admin/v2/stub/BigtableInstanceAdminStubSettings.java

@@ -421,7 +421,9 @@ public String extractNextToken(ListAppProfilesResponse payload) {
 
             @Override
             public Iterable<AppProfile> extractResources(ListAppProfilesResponse payload) {
-              return payload.getAppProfilesList();
+              return payload.getAppProfilesList() != null
+                  ? payload.getAppProfilesList()
+                  : ImmutableList.<AppProfile>of();
             }
           };
 

google-cloud-clients/google-cloud-bigtable-admin/src/main/java/com/google/cloud/bigtable/admin/v2/stub/BigtableTableAdminStubSettings.java

@@ -347,7 +347,9 @@ public String extractNextToken(ListTablesResponse payload) {
 
             @Override
             public Iterable<Table> extractResources(ListTablesResponse payload) {
-              return payload.getTablesList();
+              return payload.getTablesList() != null
+                  ? payload.getTablesList()
+                  : ImmutableList.<Table>of();
             }
           };
 
@@ -381,7 +383,9 @@ public String extractNextToken(ListSnapshotsResponse payload) {
 
             @Override
             public Iterable<Snapshot> extractResources(ListSnapshotsResponse payload) {
-              return payload.getSnapshotsList();
+              return payload.getSnapshotsList() != null
+                  ? payload.getSnapshotsList()
+                  : ImmutableList.<Snapshot>of();
             }
           };
 

google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/AcceleratorTypeStubSettings.java

@@ -250,7 +250,9 @@ public String extractNextToken(AcceleratorTypeAggregatedList payload) {
             @Override
             public Iterable<AcceleratorTypesScopedList> extractResources(
                 AcceleratorTypeAggregatedList payload) {
-              return payload.getItemsMap().values();
+              return payload.getItemsMap() != null
+                  ? payload.getItemsMap().values()
+                  : ImmutableList.<AcceleratorTypesScopedList>of();
             }
           };
 
@@ -292,7 +294,9 @@ public String extractNextToken(AcceleratorTypeList payload) {
 
             @Override
             public Iterable<AcceleratorType> extractResources(AcceleratorTypeList payload) {
-              return payload.getItemsList();
+              return payload.getItemsList() != null
+                  ? payload.getItemsList()
+                  : ImmutableList.<AcceleratorType>of();
             }
           };
 

google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/AddressStubSettings.java

@@ -258,7 +258,9 @@ public String extractNextToken(AddressAggregatedList payload) {
 
             @Override
             public Iterable<AddressesScopedList> extractResources(AddressAggregatedList payload) {
-              return payload.getItemsMap().values();
+              return payload.getItemsMap() != null
+                  ? payload.getItemsMap().values()
+                  : ImmutableList.<AddressesScopedList>of();
             }
           };
 
@@ -294,7 +296,9 @@ public String extractNextToken(AddressList payload) {
 
             @Override
             public Iterable<Address> extractResources(AddressList payload) {
-              return payload.getItemsList();
+              return payload.getItemsList() != null
+                  ? payload.getItemsList()
+                  : ImmutableList.<Address>of();
             }
           };
 

google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/AutoscalerStubSettings.java

@@ -278,7 +278,9 @@ public String extractNextToken(AutoscalerAggregatedList payload) {
             @Override
             public Iterable<AutoscalersScopedList> extractResources(
                 AutoscalerAggregatedList payload) {
-              return payload.getItemsMap().values();
+              return payload.getItemsMap() != null
+                  ? payload.getItemsMap().values()
+                  : ImmutableList.<AutoscalersScopedList>of();
             }
           };
 
@@ -314,7 +316,9 @@ public String extractNextToken(AutoscalerList payload) {
 
             @Override
             public Iterable<Autoscaler> extractResources(AutoscalerList payload) {
-              return payload.getItemsList();
+              return payload.getItemsList() != null
+                  ? payload.getItemsList()
+                  : ImmutableList.<Autoscaler>of();
             }
           };
 

google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/BackendBucketStubSettings.java

@@ -288,7 +288,9 @@ public String extractNextToken(BackendBucketList payload) {
 
             @Override
             public Iterable<BackendBucket> extractResources(BackendBucketList payload) {
-              return payload.getItemsList();
+              return payload.getItemsList() != null
+                  ? payload.getItemsList()
+                  : ImmutableList.<BackendBucket>of();
             }
           };
 

google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/BackendServiceStubSettings.java

@@ -335,7 +335,9 @@ public String extractNextToken(BackendServiceAggregatedList payload) {
             @Override
             public Iterable<BackendServicesScopedList> extractResources(
                 BackendServiceAggregatedList payload) {
-              return payload.getItemsMap().values();
+              return payload.getItemsMap() != null
+                  ? payload.getItemsMap().values()
+                  : ImmutableList.<BackendServicesScopedList>of();
             }
           };
 
@@ -375,7 +377,9 @@ public String extractNextToken(BackendServiceList payload) {
 
             @Override
             public Iterable<BackendService> extractResources(BackendServiceList payload) {
-              return payload.getItemsList();
+              return payload.getItemsList() != null
+                  ? payload.getItemsList()
+                  : ImmutableList.<BackendService>of();
             }
           };
 

google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/DiskStubSettings.java

@@ -279,7 +279,9 @@ public String extractNextToken(DiskAggregatedList payload) {
 
             @Override
             public Iterable<DisksScopedList> extractResources(DiskAggregatedList payload) {
-              return payload.getItemsMap().values();
+              return payload.getItemsMap() != null
+                  ? payload.getItemsMap().values()
+                  : ImmutableList.<DisksScopedList>of();
             }
           };
 
@@ -313,7 +315,9 @@ public String extractNextToken(DiskList payload) {
 
             @Override
             public Iterable<Disk> extractResources(DiskList payload) {
-              return payload.getItemsList();
+              return payload.getItemsList() != null
+                  ? payload.getItemsList()
+                  : ImmutableList.<Disk>of();
             }
           };
 

google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/DiskTypeStubSettings.java

@@ -242,7 +242,9 @@ public String extractNextToken(DiskTypeAggregatedList payload) {
 
             @Override
             public Iterable<DiskTypesScopedList> extractResources(DiskTypeAggregatedList payload) {
-              return payload.getItemsMap().values();
+              return payload.getItemsMap() != null
+                  ? payload.getItemsMap().values()
+                  : ImmutableList.<DiskTypesScopedList>of();
             }
           };
 
@@ -278,7 +280,9 @@ public String extractNextToken(DiskTypeList payload) {
 
             @Override
             public Iterable<DiskType> extractResources(DiskTypeList payload) {
-              return payload.getItemsList();
+              return payload.getItemsList() != null
+                  ? payload.getItemsList()
+                  : ImmutableList.<DiskType>of();
             }
           };
 

google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/FirewallStubSettings.java

@@ -252,7 +252,9 @@ public String extractNextToken(FirewallList payload) {
 
             @Override
             public Iterable<Firewall> extractResources(FirewallList payload) {
-              return payload.getItemsList();
+              return payload.getItemsList() != null
+                  ? payload.getItemsList()
+                  : ImmutableList.<Firewall>of();
             }
           };
 

google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/ForwardingRuleStubSettings.java

@@ -281,7 +281,9 @@ public String extractNextToken(ForwardingRuleAggregatedList payload) {
             @Override
             public Iterable<ForwardingRulesScopedList> extractResources(
                 ForwardingRuleAggregatedList payload) {
-              return payload.getItemsMap().values();
+              return payload.getItemsMap() != null
+                  ? payload.getItemsMap().values()
+                  : ImmutableList.<ForwardingRulesScopedList>of();
             }
           };
 
@@ -321,7 +323,9 @@ public String extractNextToken(ForwardingRuleList payload) {
 
             @Override
             public Iterable<ForwardingRule> extractResources(ForwardingRuleList payload) {
-              return payload.getItemsList();
+              return payload.getItemsList() != null
+                  ? payload.getItemsList()
+                  : ImmutableList.<ForwardingRule>of();
             }
           };
 

google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/GlobalAddressStubSettings.java

@@ -244,7 +244,9 @@ public String extractNextToken(AddressList payload) {
 
             @Override
             public Iterable<Address> extractResources(AddressList payload) {
-              return payload.getItemsList();
+              return payload.getItemsList() != null
+                  ? payload.getItemsList()
+                  : ImmutableList.<Address>of();
             }
           };
 

google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/GlobalForwardingRuleStubSettings.java

@@ -266,7 +266,9 @@ public String extractNextToken(ForwardingRuleList payload) {
 
             @Override
             public Iterable<ForwardingRule> extractResources(ForwardingRuleList payload) {
-              return payload.getItemsList();
+              return payload.getItemsList() != null
+                  ? payload.getItemsList()
+                  : ImmutableList.<ForwardingRule>of();
             }
           };
 

google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/GlobalOperationStubSettings.java

@@ -257,7 +257,9 @@ public String extractNextToken(OperationAggregatedList payload) {
             @Override
             public Iterable<OperationsScopedList> extractResources(
                 OperationAggregatedList payload) {
-              return payload.getItemsMap().values();
+              return payload.getItemsMap() != null
+                  ? payload.getItemsMap().values()
+                  : ImmutableList.<OperationsScopedList>of();
             }
           };
 
@@ -298,7 +300,9 @@ public String extractNextToken(OperationList payload) {
 
             @Override
             public Iterable<Operation> extractResources(OperationList payload) {
-              return payload.getItemsList();
+              return payload.getItemsList() != null
+                  ? payload.getItemsList()
+                  : ImmutableList.<Operation>of();
             }
           };
 

google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/HealthCheckStubSettings.java

@@ -260,7 +260,9 @@ public String extractNextToken(HealthCheckList payload) {
 
             @Override
             public Iterable<HealthCheck> extractResources(HealthCheckList payload) {
-              return payload.getItemsList();
+              return payload.getItemsList() != null
+                  ? payload.getItemsList()
+                  : ImmutableList.<HealthCheck>of();
             }
           };
 

google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/HttpHealthCheckStubSettings.java

@@ -270,7 +270,9 @@ public String extractNextToken(HttpHealthCheckList payload) {
 
             @Override
             public Iterable<HttpHealthCheck2> extractResources(HttpHealthCheckList payload) {
-              return payload.getItemsList();
+              return payload.getItemsList() != null
+                  ? payload.getItemsList()
+                  : ImmutableList.<HttpHealthCheck2>of();
             }
           };
 

google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/HttpsHealthCheckStubSettings.java

@@ -272,7 +272,9 @@ public String extractNextToken(HttpsHealthCheckList payload) {
 
             @Override
             public Iterable<HttpsHealthCheck2> extractResources(HttpsHealthCheckList payload) {
-              return payload.getItemsList();
+              return payload.getItemsList() != null
+                  ? payload.getItemsList()
+                  : ImmutableList.<HttpsHealthCheck2>of();
             }
           };
 

google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/ImageStubSettings.java

@@ -258,7 +258,9 @@ public String extractNextToken(ImageList payload) {
 
             @Override
             public Iterable<Image> extractResources(ImageList payload) {
-              return payload.getItemsList();
+              return payload.getItemsList() != null
+                  ? payload.getItemsList()
+                  : ImmutableList.<Image>of();
             }
           };
 

google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/InstanceGroupManagerStubSettings.java

@@ -367,7 +367,9 @@ public String extractNextToken(InstanceGroupManagerAggregatedList payload) {
             @Override
             public Iterable<InstanceGroupManagersScopedList> extractResources(
                 InstanceGroupManagerAggregatedList payload) {
-              return payload.getItemsMap().values();
+              return payload.getItemsMap() != null
+                  ? payload.getItemsMap().values()
+                  : ImmutableList.<InstanceGroupManagersScopedList>of();
             }
           };
 
@@ -411,7 +413,9 @@ public String extractNextToken(InstanceGroupManagerList payload) {
             @Override
             public Iterable<InstanceGroupManager> extractResources(
                 InstanceGroupManagerList payload) {
-              return payload.getItemsList();
+              return payload.getItemsList() != null
+                  ? payload.getItemsList()
+                  : ImmutableList.<InstanceGroupManager>of();
             }
           };