Fix URL reconstruction

plugins/c9.ide.plugins/manager.js

@@ -667,9 +667,8 @@ define(function(require, exports, module) {
         function reload(name) {
             showReloadTip();
             
-            var href = document.location.href.replace(/[?&]reload=[^&]+/, "")
-                + (document.location.href.match(/\?/) ? "&" : "?")
-                + "reload=" + name;
+            var href = document.location.href.replace(/[?&]reload=[^&]+/, "");
+            href += (href.match(/\?/) ? "&" : "?") + "reload=" + name;
             window.history.replaceState(window.history.state, null, href);
             
             for (var plugin in architect.lut) {