Add back response property assignment removed by mistake.

src/Controller/Component/RequestHandlerComponent.php

@@ -149,6 +149,7 @@ public function implementedEvents() {
 	public function initialize(array $config) {
 		$controller = $this->_registry->getController();
 		$request = $this->request = $controller->request;
+		$this->response = $controller->response;
 
 		if (isset($request->params['_ext'])) {
 			$this->ext = $request->params['_ext'];