resolve new discussion error refs #10385 (#10386)

Co-authored-by: simon <chevancs@ujf-grenoble.fr>

controllers/grid/queries/QueriesGridHandler.php

@@ -672,7 +672,7 @@ public function updateQuery($args, $request)
                     $user->getId(),
                     $request->getContext()->getId()
                 );
-                if (in_array(Notification::NOTIFICATION_TYPE_NEW_QUERY, $notificationSubscriptionSettings)) {
+                if (!$notification || in_array(Notification::NOTIFICATION_TYPE_NEW_QUERY, $notificationSubscriptionSettings)) {
                     continue;
                 }