From dd745e0cf0a2a7c1ead84e26c538fd8591183641 Mon Sep 17 00:00:00 2001
From: Erik Sundell <erik.sundell87@gmail.com>
Date: Thu, 11 Oct 2018 15:42:44 +0200
Subject: [PATCH] stackdriver: prevent backend query from being made when there
 are not yet any defined targets

---
 .../datasource/stackdriver/datasource.ts      | 24 +++++++++++--------
 1 file changed, 14 insertions(+), 10 deletions(-)

diff --git a/public/app/plugins/datasource/stackdriver/datasource.ts b/public/app/plugins/datasource/stackdriver/datasource.ts
index 7497edb95a8..cda952c23b9 100644
--- a/public/app/plugins/datasource/stackdriver/datasource.ts
+++ b/public/app/plugins/datasource/stackdriver/datasource.ts
@@ -50,16 +50,20 @@ export default class StackdriverDatasource {
         };
       });
 
-    const { data } = await this.backendSrv.datasourceRequest({
-      url: '/api/tsdb/query',
-      method: 'POST',
-      data: {
-        from: options.range.from.valueOf().toString(),
-        to: options.range.to.valueOf().toString(),
-        queries,
-      },
-    });
-    return data;
+    if (queries.length > 0) {
+      const { data } = await this.backendSrv.datasourceRequest({
+        url: '/api/tsdb/query',
+        method: 'POST',
+        data: {
+          from: options.range.from.valueOf().toString(),
+          to: options.range.to.valueOf().toString(),
+          queries,
+        },
+      });
+      return data;
+    } else {
+      return { results: [] };
+    }
   }
 
   async getLabels(metricType, refId) {