add error handling for bad credentials

backend/src/controllers/scheduledMessages.controller.ts

@@ -77,7 +77,7 @@ class ScheduledMessagesController {
         res.json({ configured: false });
         return;
       }
-      res.json({ configured: true, data: result.data });
+      res.json({ configured: true, data: result.data, error: result.error });
     } catch (error) {
       logger.error('ScheduledMessagesController.getRooms error', { error });
       res.status(500).json({ success: false, message: 'Räume konnten nicht geladen werden' });