Executing default update process handler, in case auto-update fails.

src/extensions/default/AutoUpdate/main.js

@@ -486,12 +486,12 @@ define(function (require, exports, module) {
 
             } else {
                 // Update not present for current platform
-                return;
+                return false;
             }
 
             if (!checksum || !downloadURL || !installerName) {
                 console.warn("AutoUpdate : asset information incorrect for the update");
-                return;
+                return false;
             }
 
             var updateParams = {

src/utils/UpdateNotification.js

@@ -512,7 +512,12 @@ define(function (require, exports, module) {
      */
     function handleUpdateProcess(updates) {
         var handler = _updateProcessHandler || _defaultUpdateProcessHandler;
-        handler(updates);
+        var success = handler(updates);
+        if (_updateProcessHandler && !success) {
+            // Give a chance to default handler in case
+            // the auot update mechanism has failed.
+            _defaultUpdateProcessHandler(updates);
+        }
     }
 
     /**