Protocol required in isValidURL

www/common/common-util.js

@@ -555,7 +555,7 @@
     };
 
     Util.isValidURL = function (str) {
-        var pattern = new RegExp('^(https?:\\/\\/)?'+ // protocol
+        var pattern = new RegExp('^(https?:\\/\\/)'+ // protocol
             '((([a-z\\d]([a-z\\d-]*[a-z\\d])*)\\.)+[a-z]{2,}|'+ // domain name
             '((\\d{1,3}\\.){3}\\d{1,3}))'+ // OR ip (v4) address
             '(\\:\\d+)?(\\/[-a-z\\d%_.~+]*)*'+ // port and path