Find another instance where we should null out the node pointer for the current listener after it has been disassociated with the node.

cocos/2d/CCEventDispatcher.cpp

@@ -1218,6 +1218,7 @@ void EventDispatcher::removeEventListenersForListenerID(const EventListener::Lis
                 if (l->getSceneGraphPriority() != nullptr)
                 {
                     dissociateNodeAndEventListener(l->getSceneGraphPriority(), l);
+                    l->setSceneGraphPriority(nullptr);  // NULL out the node pointer so we don't have any dangling pointers to destroyed nodes.
                 }
                 
                 if (_inDispatch == 0)