Noissue - Check if ExtensionPanel has onSearch before adding listener

devtools.js

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-2017 eyeo GmbH
  *
  * Adblock Plus is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 3 as
  * published by the Free Software Foundation.
  *
  * Adblock Plus is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 26 matching lines @@
           panel.onShown.addListener(window =>
           {
             panelWindow = window;
           });
 
           panel.onHidden.addListener(window =>
           {
             panelWindow = null;
           });
 
-          panel.onSearch.addListener((eventName, queryString) =>
+          if (panel.onSearch)
           {
-            if (panelWindow)
-              panelWindow.postMessage({type: eventName, queryString}, "*");
-          });
+            panel.onSearch.addListener((eventName, queryString) =>
+            {
+              if (panelWindow)
+                panelWindow.postMessage({type: eventName, queryString}, "*");
+            });
+          }
         }
       );
     }
   }
 );