[BUGFIX] Prevent undefined array key in new content element wizard

Prevent PHP 8.1 undefined array key for wizard items without
description or without title.

Resolves: #99015
Releases: main, 11.5
Change-Id: I141aa8e0003a2e3b783fb78fddf9db5e602ea40d
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/76454


Tested-by: Susanne Moog <look@susi.dev>
Tested-by: Chris Müller <typo3@krue.ml>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Susanne Moog <look@susi.dev>
Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>
Reviewed-by: Oliver Bartsch <bo@cedev.de>

typo3/sysext/backend/Classes/Controller/ContentElement/NewContentElementController.php

@@ -265,8 +265,8 @@ class NewContentElementController
 
     protected function getWizardItem(array $itemConf): array
     {
-        $itemConf['title'] = $this->getLanguageService()->sL($itemConf['title']);
-        $itemConf['description'] = $this->getLanguageService()->sL($itemConf['description']);
+        $itemConf['title'] = $this->getLanguageService()->sL($itemConf['title'] ?? '');
+        $itemConf['description'] = $this->getLanguageService()->sL($itemConf['description'] ?? '');
         $itemConf['saveAndClose'] = (bool)($itemConf['saveAndClose'] ?? false);
         $itemConf['tt_content_defValues'] = $itemConf['tt_content_defValues.'] ?? [];
         unset($itemConf['tt_content_defValues.']);