fix gatewayjs redirect

src/main/ui/static/templates/alipay/v1/gateway_jsapi.js

@@ -10,6 +10,7 @@ $(document).ready(function () {
             alert('debug:origin redirect:' + window.redirect);
         }
         var redirect = window.redirect;
+            if (window.redirect !=null) {
                 while (redirect.indexOf('://') < 0) {
                     redirect = decodeURIComponent(redirect);
                     if (redirect == window.redirect) {
@@ -17,6 +18,7 @@ $(document).ready(function () {
                     }
                     window.redirect = redirect;
                 }
+        }
 
     }