Merge pull request #3188 from mtanda/template_error_report

Fix templating error dialog for Prometheus

public/app/services/backendSrv.js

@@ -106,6 +106,11 @@ function (angular, _, config) {
           });
         }
 
+        // for Prometheus
+        if (!err.data.message && _.isString(err.data.error)) {
+          err.data.message = err.data.error;
+        }
+
         throw err;
       });
     };