[BUGFIX] Use array key access guard in WorkspaceVersionRecordsCommand

Resolves: #98361
Releases: main, 11.5
Change-Id: Ib94267b45199a5cf5cce3fa48df51e53cff9a256
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/75741
Tested-by: core-ci <typo3@b13.com>
Tested-by: Stefan Bürk <stefan@buerk.tech>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>
Reviewed-by: Stefan Bürk <stefan@buerk.tech>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>

typo3/sysext/workspaces/Classes/Command/WorkspaceVersionRecordsCommand.php

@@ -348,7 +348,7 @@ protected function traversePageTreeForVersionedRecords(int $rootID, int $depth,
             $versions = BackendUtility::selectVersionsOfRecord('pages', $rootID, 'uid,t3ver_oid,t3ver_wsid', null, true);
             if (is_array($versions)) {
                 foreach ($versions as $verRec) {
-                    if (!$verRec['_CURRENT_VERSION']) {
+                    if (!($verRec['_CURRENT_VERSION'] ?? false)) {
                         $this->traversePageTreeForVersionedRecords((int)$verRec['uid'], $depth, true, true);
                     }
                 }