Add sidebar check

jet/static/jet/js/src/features/sidebar/main.js

@@ -72,6 +72,10 @@ SideBar.prototype = {
         $.cookie('sidebar_pinned', status, { expires: 365, path: '/' });
     },
     addToggleButton: function() {
+        if (!this.$sidebar.length) {
+            return;
+        }
+
         var $button = $('<span>')
           .addClass('sidebar-container-toggle sidebar-header-menu-icon icon-menu sidebar-toggle');