Stopped onActivityResult from proceeding when intent is null; (#352)

Author: AlgirdasVZ

android/src/main/java/com/rnappauth/RNAppAuthModule.java

@@ -300,6 +300,11 @@ public void onFetchConfigurationCompleted(
     @Override
     public void onActivityResult(Activity activity, int requestCode, int resultCode, Intent data) {
         if (requestCode == 0) {
+            if (data == null) {
+                promise.reject("Failed to authenticate", "Data intent is null" );
+                return;
+            }
+            
             final AuthorizationResponse response = AuthorizationResponse.fromIntent(data);
             AuthorizationException exception = AuthorizationException.fromIntent(data);
             if (exception != null) {