Hide menu container tag when items is empty

framework/widgets/Menu.php

@@ -166,10 +166,12 @@ class Menu extends Widget
             $this->params = Yii::$app->request->getQueryParams();
         }
         $items = $this->normalizeItems($this->items, $hasActiveChild);
+        if (!empty($items)) {
             $options = $this->options;
             $tag = ArrayHelper::remove($options, 'tag', 'ul');
             echo Html::tag($tag, $this->renderItems($items), $options);
         }
+    }
 
     /**
      * Recursively renders the menu items (without the container tag).