TF-1842: Handle error for _deleteSendingEmailAction and _sendEmailAction

(cherry picked from commit 7b2ab3e85a778a6662ede7c81b3cdddcbd0e7204)

lib/features/mailbox_dashboard/presentation/controller/mailbox_dashboard_controller.dart

@@ -1533,7 +1533,7 @@ class MailboxDashBoardController extends ReloadableController {
 
   void _handleMessageFromNotification(String? payload, {bool onForeground = true}) {
     log('MailboxDashBoardController::_handleMessageFromNotification():payload: $payload');
-    if (payload == null) {
+    if (payload == null || payload.isEmpty) {
       dispatchRoute(DashboardRoutes.thread);
       return;
     }