assure initialization of eventStack

src/Authorization/EventSubscriber/AbstractGetAttributeSubscriber.php

@@ -11,7 +11,7 @@ use Symfony\Component\EventDispatcher\EventSubscriberInterface;
 abstract class AbstractGetAttributeSubscriber implements EventSubscriberInterface
 {
     /** @var array */
-    private $eventStack;
+    private $eventStack = [];
 
     public static function getSubscribedEvents(): array
     {
@@ -21,11 +21,6 @@ abstract class AbstractGetAttributeSubscriber implements EventSubscriberInterfac
         ];
     }
 
-    public function __construct()
-    {
-        $this->eventStack = [];
-    }
-
     public function onGetAvailableAttributes(GetAvailableAttributesEvent $event)
     {
         $event->addAttributes($this->getNewAttributes());
@@ -34,6 +29,7 @@ abstract class AbstractGetAttributeSubscriber implements EventSubscriberInterfac
     public function onGetAttributeEvent(GetAttributeEvent $event)
     {
         try {
+            dump($this->getNewAttributes());
             array_push($this->eventStack, $event);
             $attributeName = $event->getAttributeName();