[BUGFIX] Check if page exist before using record for preview

Deleted pages must be excluded at content element previews in the page
module to avoid exceptions.

Resolves: #93938
Related: #93659
Releases: master, 10.4
Change-Id: I8786a6a93eac354684542d54ca1270d58cb05530
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/68798
Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Riccardo De Contardi <erredeco@gmail.com>
Tested-by: Oliver Bartsch <bo@cedev.de>
Tested-by: Richard Haeser <richard@richardhaeser.com>
Reviewed-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Richard Haeser <richard@richardhaeser.com>

typo3/sysext/backend/Classes/Preview/StandardContentPreviewRenderer.php

@@ -392,7 +392,9 @@ protected function generateListForMenuContentTypes(array $record): string
         foreach ($uidList as $uid) {
             $uid = (int)$uid;
             $pageRecord = BackendUtility::getRecord($table, $uid, 'title');
-            $content .= '<br>' . htmlspecialchars($pageRecord['title']) . ' (' . $uid . ')';
+            if ($pageRecord) {
+                $content .= '<br>' . htmlspecialchars($pageRecord['title']) . ' (' . $uid . ')';
+            }
         }
         return $content;
     }