Fix NPE when activity is relaunched on changing font size of the phone (#2319)

android/app/src/main/java/com/reactnativenavigation/controllers/NavigationActivity.java

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
-        if (!NavigationApplication.instance.getReactGateway().hasStartedCreatingContext()) {
+         if (!NavigationApplication.instance.getReactGateway().hasStartedCreatingContext() || 
+                getIntent() == null || 
+                getIntent().getBundleExtra("ACTIVITY_PARAMS_BUNDLE") == null) {
             SplashActivity.start(this);
             finish();
             return;