Allow update of state to receive null objects

Summary:
This diff changes updateState method to support null stateWrappers, before this method would crash with a NullPointerException, now it allows the null object to reach the view manager.

Changelog: Add support for update of nullable localState in Fabric

Reviewed By: JoshuaGross

Differential Revision: D17939651

fbshipit-source-id: c62555905e39f9e0db75b9e1d1b93f33d0560266

ReactAndroid/src/main/java/com/facebook/react/uimanager/ViewManager.java

@@ -282,7 +282,7 @@ public abstract class ViewManager<T extends View, C extends ReactShadowNode>
    * this component type.
    */
   public @Nullable Object updateState(
-      @NonNull T view, ReactStylesDiffMap props, StateWrapper stateWrapper) {
+      @NonNull T view, ReactStylesDiffMap props, @Nullable StateWrapper stateWrapper) {
     return null;
   }