warden_server: fixed quoting typo

warden3/warden_server/warden_server.py

@@ -891,9 +891,9 @@ class WardenHandler(ObjectReq):
             ev_id = event['Node'][0]['Name'].lower()
         except (KeyError, TypeError):
             # Event does not bear valid Node attribute
-            return [{"error": 422, message: "Event does not bear valid Node attribute"}]
+            return [{"error": 422, "message": "Event does not bear valid Node attribute"}]
         if ev_id != identity:
-            return [{"error": 422, message: "Node does not correspond with saving client"}]
+            return [{"error": 422, "message": "Node does not correspond with saving client"}]
         return []