Added polyfils for IE console object.

UI/Instrumentation/ErrorHandler.js

@@ -1,15 +1,13 @@
 'use strict';
 (function () {
 
-    if (!window.console) {
+    window.console = window.console || {};
-        window.console = {};
+    window.console.log = window.console.log || function(){};
-    }
+    window.console.group = window.console.group || function(){};
-
+    window.console.groupEnd = window.console.groupEnd || function(){};
-    if (!window.console.debug) {
+    window.console.debug = window.console.debug || function(){};
-        window.console.debug = function () {
+    window.console.warn = window.console.warn || function(){};
-
+    window.console.assert = window.console.assert || function(){};
-        };
-    }
 
     window.alert = function (message) {
         window.Messenger().post(message);