fix: influxdb test data source error handling now works better, fixes #8577

public/app/plugins/datasource/influxdb/datasource.ts

@@ -200,10 +200,7 @@ export default class InfluxDatasource {
       }
       return { status: "success", message: "Data source is working", title: "Success" };
     }).catch(err => {
-      if (err.data && err.message) {
+      return { status: "error", message: err.message, title: "Test Failed" };
-        return { status: "error", message: err.data.message, title: "InfluxDB Error" };
-      }
-      return { status: "error", message: err.toString(), title: "InfluxDB Error" };
     });
   }
 
@@ -250,9 +247,9 @@ export default class InfluxDatasource {
     }, function(err) {
       if (err.status !== 0 || err.status >= 300) {
         if (err.data && err.data.error) {
-          throw { message: 'InfluxDB Error Response: ' + err.data.error, data: err.data, config: err.config };
+          throw { message: 'InfluxDB Error: ' + err.data.error, data: err.data, config: err.config };
         } else {
-          throw { message: 'InfluxDB Error: ' + err.message, data: err.data, config: err.config };
+          throw { message: 'Network Error: ' + err.statusText + '(' + err.status + ')', data: err.data, config: err.config };
         }
       }
     });