wip first not first or fail attributes form

src/Controller/ProductCategoryAttributesController.php

@@ -167,6 +167,9 @@ class ProductCategoryAttributesController extends AppController
         return $this->redirect(['action' => 'index']);
     }
 
+    /**
+     * @return void
+     */
     public function form()
     {
         $productCategoryAttributes = $this->getTable()->getAllCategoryAttributesForCategoryId($this->request->getQuery('product_category_id', '-1'));