add "No appropriate kernel" button to kernel-selection prompt

IPython/html/static/notebook/js/kernelselector.js

@@ -248,6 +248,12 @@ define([
             title : 'Kernel not found',
             body : body,
             buttons : {
+                'No appropriate kernel' : {
+                    class : 'btn-danger',
+                    click : function () {
+                        that.events.trigger('no_kernel.Kernel');
+                    }
+                },
                 OK : {
                     class : 'btn-primary',
                     click : function () {

IPython/html/static/notebook/js/notificationarea.js

@@ -187,6 +187,10 @@ define([
 
             showMsg();
         });
+        
+        this.events.on("no_kernel.Kernel", function (evt, data) {
+            $("#kernel_indicator").find('.kernel_indicator_name').text("No Kernel");
+        });
 
         this.events.on('kernel_dead.Session', function (evt, info) {
             var full = info.xhr.responseJSON.message;