Fix broken selectable state for list view items (#13148)

src/Umbraco.Web.UI.Client/src/views/content/apps/listview/listview.controller.js

@@ -9,9 +9,9 @@
 
     function propertyEditorReadonly () {
       // check for permission to update
-      return !(typeof $scope.variantContent !== 'undefined' && $scope.variantContent.allowedActions.includes('A'));
+      return $scope.variantContent && !$scope.variantContent.allowedActions.includes('A');
     }
-      
+
   }
 
   angular.module("umbraco").controller("Umbraco.Editors.Content.Apps.ListViewController", ContentAppListViewController);