test kernel for undefined rather than off

IPython/frontend/html/notebook/handlers.py

@@ -597,8 +597,6 b' class NotebookRootHandler(AuthenticatedHandler):'
             kid = km.kernel_for_notebook(nid)
             if  kid is not None:
                 f['kernel_status']=kid
-            else:
-                f['kernel_status']='off'
         self.finish(jsonapi.dumps(files))
 
     @web.authenticated

IPython/frontend/html/notebook/static/js/notebooklist.js

@@ -113,7 +113,7 b' var IPython = (function (IPython) {'
             this.add_link(notebook_id, nbname, item);
             if (!IPython.read_only){
                 // hide delete buttons when readonly
-                if(kernel == 'off'){
+                if(kernel == undefined){
                     this.add_delete_button(item);
                 } else {
                     this.add_shutdown_button(item,kernel);
@@ -192,7 +192,6 b' var IPython = (function (IPython) {'
                     type : "DELETE",
                     dataType : "json",
                     success : function (data, status, xhr) {
-                        console.log('kernel killed');
                         that.load_list();
                     }
                 };