From b076394cd359d09ca168697fb967ec2223cf1c2f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Torkel=20=C3=96degaard?= <torkel@grafana.com>
Date: Mon, 20 Jul 2020 11:31:51 +0200
Subject: [PATCH] BackendSrv: Fix error alert logic (#26453)

(cherry picked from commit fba329f3acaba5d2b7db327e1fd31531887ae880)
---
 public/app/features/templating/template_srv.ts | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/public/app/features/templating/template_srv.ts b/public/app/features/templating/template_srv.ts
index 36c032e9acc..a1708f8730e 100644
--- a/public/app/features/templating/template_srv.ts
+++ b/public/app/features/templating/template_srv.ts
@@ -298,7 +298,8 @@ export class TemplateSrv implements BaseTemplateSrv {
 
   variableExists(expression: string) {
     const name = this.getVariableName(expression);
-    return name && this.getVariableAtIndex(name) !== void 0;
+    const variable = name && this.getVariableAtIndex(name);
+    return variable !== null && variable !== undefined;
   }
 
   highlightVariablesAsHtml(str: string) {
@@ -458,7 +459,7 @@ export class TemplateSrv implements BaseTemplateSrv {
     return value.join(',');
   }
 
-  private getVariableAtIndex = (name: string): any => {
+  private getVariableAtIndex(name: string) {
     if (!name) {
       return;
     }
@@ -468,11 +469,11 @@ export class TemplateSrv implements BaseTemplateSrv {
     }
 
     return this.index[name];
-  };
+  }
 
-  private getAdHocVariables = (): any[] => {
+  private getAdHocVariables(): any[] {
     return this.dependencies.getFilteredVariables(isAdHoc);
-  };
+  }
 }
 
 // Expose the template srv