do not display admin menu if it has no children (#500)

src/Event/ConfigureMainMenuEvent.php

@@ -9,10 +9,51 @@
 
 namespace App\Event;
 
+use KevinPapst\AdminLTEBundle\Event\SidebarMenuEvent;
+use Symfony\Component\EventDispatcher\Event;
+use Symfony\Component\HttpFoundation\Request;
+
 /**
  * The ConfigureMainMenuEvent is used for populating the main navigation.
  */
-class ConfigureMainMenuEvent extends ConfigureMenuEvent
+class ConfigureMainMenuEvent extends Event
 {
     public const CONFIGURE = 'app.main_menu_configure';
+
+    /**
+     * @var Request
+     */
+    private $request;
+    /**
+     * @var SidebarMenuEvent
+     */
+    private $event;
+
+    /**
+     * @param Request $request
+     * @param SidebarMenuEvent $event
+     */
+    public function __construct(
+        Request $request,
+        SidebarMenuEvent $event
+    ) {
+        $this->request = $request;
+        $this->event = $event;
+    }
+
+    /**
+     * @return Request
+     */
+    public function getRequest()
+    {
+        return $this->request;
+    }
+
+    /**
+     * @return SidebarMenuEvent
+     */
+    public function getMenu()
+    {
+        return $this->event;
+    }
 }