[DevTools] Fix event listener sidebar

third_party/WebKit/Source/devtools/front_end/sdk/RuntimeModel.js

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 561 matching lines @@
  * @param {string=} listenerType
  */
 WebInspector.EventListener = function(target, type, useCapture, handler, originalHandler, location, removeFunction, listenerType)
 {
     WebInspector.SDKObject.call(this, target);
     this._type = type;
     this._useCapture = useCapture;
     this._handler = handler;
     this._originalHandler = originalHandler || handler;
     this._location = location;
-    this._sourceURL = location.script().contentURL();
+    var script = location.script();
+    this._sourceURL = script ? script.contentURL() : "";
     this._removeFunction = removeFunction;
     this._listenerType = listenerType || "normal";
 }
 
 WebInspector.EventListener.prototype = {
     /**
      * @return {string}
      */
     type: function()
     {
@@ skipping 94 matching lines @@
     /**
      * @param {string} listenerType
      */
     setListenerType: function(listenerType)
     {
         this._listenerType = listenerType;
     },
 
     __proto__: WebInspector.SDKObject.prototype
 }