Fix extra "resolved" message

src/alertify/messaging.py

@@ -31,6 +31,10 @@ class MessageHandler:
                     for alert_id in self.gotify.find_byfingerprint(alert):
                         if not self.gotify.delete(alert_id):
                             logging.error('There was a problem removing message ID %d', alert_id)
+                    return {
+                        'status': 200,
+                        'reason': 'Message deletion complete'
+                    }
 
                 prefix = 'resolved'
             else: