Part 2: Make CatalystInstanceImpl.getNativeModule Nullable

Summary:
This is the codemod portion of the parent diff.

I modified all call-sites to `ReactContext.getNativeModule` to do a null check on the returned NativeModule.

Changelog:
[Android][Fixed] - Check if NativeModules returned from CatalystInstanceImpl.getNativeModule are null before using them.

Reviewed By: JoshuaGross

Differential Revision: D21272028

fbshipit-source-id: 6bd16c6bf30605f2dfdf4c481352063712965342

ReactAndroid/src/androidTest/java/com/facebook/react/testing/rule/ReactNativeTestRule.java

@@ -95,6 +95,11 @@ public class ReactNativeTestRule implements TestRule {
                   public void onReactContextInitialized(ReactContext reactContext) {
                     final UIManagerModule uiManagerModule =
                         reactContext.getCatalystInstance().getNativeModule(UIManagerModule.class);
+
+                    if (uiManagerModule == null) {
+                      return;
+                    }
+
                     uiManagerModule
                         .getUIImplementation()
                         .setLayoutUpdateListener(