[BUGFIX] Fix wrong extbase type mapping in mail queue after sending mails

Classes/Controller/QueueController.php

@@ -70,8 +70,8 @@ class QueueController extends AbstractController {
 	}
 
 	/**
-	 * @param null $selectedTemplate
-	 * @param null $selectedExtension
+	 * @param string|null $selectedTemplate
+	 * @param string|null $selectedExtension
 	 * @param array $filters
 	 * @throws InvalidQueryException
 	 * @throws NoSuchArgumentException
@@ -80,7 +80,7 @@ class QueueController extends AbstractController {
 	 * @throws StopActionException
 	 * @throws UnsupportedRequestTypeException
 	 */
-	public function indexAction($selectedTemplate = NULL, $selectedExtension = NULL, array $filters = []): void {
+	public function indexAction(string $selectedTemplate = NULL, string $selectedExtension = NULL, array $filters = []): void {
 		$this->requireSite();
 		$this->initSessionAndTemplateFilter($filters);
 		$this->view->assignMultiple([