Issue #3377491 by LOBsTerr: Prevent showing pending invitations message on AJAX requests

   *   The RequestEvent to process.

   */

  public function notifyAboutPendingInvitations(RequestEvent $event) {

    // Skip for AJAX requests.

    if ($event->getRequest()->isXmlHttpRequest()) {

      return;

    }

    if ($this->groupInvitationLoader->loadByUser()) {

      $config = $this->configFactory->get('ginvite.pending_invitations_warning');

      // Exclude routes where this info is redundant or will generate a