Fix for log keypaths bug

Example/Tests/test.json

@@ -0,0 +1 @@
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lottie-ios/Classes/AnimatableLayers/LOTCompositionContainer.m

@@ -161,7 +161,9 @@ - (void)logHierarchyKeypathsWithParent:(NSString * _Nullable)parent {
  NSString *keypath = parent;
  if (parent && self.layerName) {
  keypath = [NSString stringWithFormat:@"%@.%@", parent, self.layerName];
- } 
+ } else if (self.layerName) {
+ keypath = self.layerName;
+ }
  for (LOTLayerContainer *layer in _childLayers) {
  [layer logHierarchyKeypathsWithParent:keypath];
  }