/** M: Don't show feedback menu if no feedback Uri is set */
 @Override
 public void onPrepareOptionsMenu(Menu menu) {
   super.onPrepareOptionsMenu(menu);
   MenuItem feedBackMenuItem = menu.findItem(R.id.feedback_menu_item);
   if (feedBackMenuItem != null) {
     Uri feedBackUri = Utils.getValidUri(getString(R.string.email_feedback_uri));
     // We only want to enable the feedback menu item, if there is a valid feedback uri
     feedBackMenuItem.setVisible(!Uri.EMPTY.equals(feedBackUri));
   }
 }