[BufferOrch] Don't call SAI API for BUFFER_POOL/PROFILE handling in c…

…ase the op is DEL and the SAI OID is NULL (#1786)

- What I did
Don't call SAI API for BUFFER_POOL/PROFILE handling in case the op is DEL and the SAI OID is NULL in order to avoid orchagent from exiting.
We need it only in 202106 or above. In 202012 the orchagent won't exit in such case.

- Why I did it
Handle rare cases which cause SAI error eventually makes orchagent to exit.

- How I verified it
Manually test.

Signed-off-by: Stephen Sun <stephens@nvidia.com>

orchagent/bufferorch.cpp

@@ -452,14 +452,17 @@ task_process_status BufferOrch::processBufferPool(KeyOpFieldsValuesTuple &tuple)
             return task_process_status::task_need_retry;
         }
 
-        sai_status = sai_buffer_api->remove_buffer_pool(sai_object);
-        if (SAI_STATUS_SUCCESS != sai_status)
+        if (SAI_NULL_OBJECT_ID != sai_object)
         {
-            SWSS_LOG_ERROR("Failed to remove buffer pool %s with type %s, rv:%d", object_name.c_str(), map_type_name.c_str(), sai_status);
-            task_process_status handle_status = handleSaiRemoveStatus(SAI_API_BUFFER, sai_status);
-            if (handle_status != task_process_status::task_success)
+            sai_status = sai_buffer_api->remove_buffer_pool(sai_object);
+            if (SAI_STATUS_SUCCESS != sai_status)
             {
-                return handle_status;
+                SWSS_LOG_ERROR("Failed to remove buffer pool %s with type %s, rv:%d", object_name.c_str(), map_type_name.c_str(), sai_status);
+                task_process_status handle_status = handleSaiRemoveStatus(SAI_API_BUFFER, sai_status);
+                if (handle_status != task_process_status::task_success)
+                {
+                    return handle_status;
+                }
             }
         }
         SWSS_LOG_NOTICE("Removed buffer pool %s with type %s", object_name.c_str(), map_type_name.c_str());
@@ -651,14 +654,17 @@ task_process_status BufferOrch::processBufferProfile(KeyOpFieldsValuesTuple &tup
             return task_process_status::task_need_retry;
         }
 
-        sai_status = sai_buffer_api->remove_buffer_profile(sai_object);
-        if (SAI_STATUS_SUCCESS != sai_status)
+        if (SAI_NULL_OBJECT_ID != sai_object)
         {
-            SWSS_LOG_ERROR("Failed to remove buffer profile %s with type %s, rv:%d", object_name.c_str(), map_type_name.c_str(), sai_status);
-            task_process_status handle_status = handleSaiRemoveStatus(SAI_API_BUFFER, sai_status);
-            if (handle_status != task_process_status::task_success)
+            sai_status = sai_buffer_api->remove_buffer_profile(sai_object);
+            if (SAI_STATUS_SUCCESS != sai_status)
             {
-                return handle_status;
+                SWSS_LOG_ERROR("Failed to remove buffer profile %s with type %s, rv:%d", object_name.c_str(), map_type_name.c_str(), sai_status);
+                task_process_status handle_status = handleSaiRemoveStatus(SAI_API_BUFFER, sai_status);
+                if (handle_status != task_process_status::task_success)
+                {
+                    return handle_status;
+                }
             }
         }