Update to drupal-org-drupal 8.0.0-rc2. For more information, see https://www.drupal.org/node/2598668

core/modules/views_ui/js/views-admin.js

@@ -5,7 +5,7 @@
 
 (function ($, Drupal, drupalSettings) {
 
-  "use strict";
+  'use strict';
 
   /**
    * @namespace
@@ -494,7 +494,7 @@
         $description = $option.find('.description');
         options[i] = {
           // Search on the lowercase version of the label text + description.
-          searchText: $label.text().toLowerCase() + " " + $description.text().toLowerCase(),
+          searchText: $label.text().toLowerCase() + ' ' + $description.text().toLowerCase(),
           // Maintain a reference to the jQuery object for each row, so we don't
           // have to create a new object inside the performance-sensitive keyup
           // handler.