ASConfiguration version check only when have json dict (#971)

* fix SIMULATE_WEB_RESPONSE not imported #449

* Fix to make rangeMode update in right time

* remove uncessary assert

* avoid extra version log.

* check dictionary earlier

Source/ASConfiguration.m

@@ -23,12 +23,16 @@ @implementation ASConfiguration
 - (instancetype)initWithDictionary:(NSDictionary *)dictionary
 {
   if (self = [super init]) {
-    autotype featureStrings = ASDynamicCast(dictionary[@"experimental_features"], NSArray);
-    autotype version = ASDynamicCast(dictionary[@"version"], NSNumber).integerValue;
-    if (version != ASConfigurationSchemaCurrentVersion) {
-      NSLog(@"Texture warning: configuration schema is old version (%zd vs %zd)", version, ASConfigurationSchemaCurrentVersion);
+    if (dictionary != nil) {
+      autotype featureStrings = ASDynamicCast(dictionary[@"experimental_features"], NSArray);
+      autotype version = ASDynamicCast(dictionary[@"version"], NSNumber).integerValue;
+      if (version != ASConfigurationSchemaCurrentVersion) {
+        NSLog(@"Texture warning: configuration schema is old version (%zd vs %zd)", version, ASConfigurationSchemaCurrentVersion);
+      }
+      self.experimentalFeatures = ASExperimentalFeaturesFromArray(featureStrings);
+    } else {
+      self.experimentalFeatures = kNilOptions;
     }
-    self.experimentalFeatures = ASExperimentalFeaturesFromArray(featureStrings);
   }
   return self;
 }