don't double-join the notebook path

IPython/html/static/tree/js/kernellist.js

@@ -27,9 +27,8 var IPython = (function (IPython) {
         var item;
         for (var i=0; i < d.length; i++) {
             var path = utils.url_path_join(d[i].notebook.path, d[i].notebook.name);
-            var name = d[i].name;
             item = this.new_notebook_item(i);
-            this.add_link(path, path, item);
+            this.add_link('', path, item);
             this.sessions[path] = d[i].id;
             this.add_shutdown_button(item,this.sessions[path]);
         }