[BUGFIX] Handle missing pageRow in DatabaseRecordList

Avoid PHP warning if pageRow is empty, i.e. no 'editlock' can be checked.

Releases: main, 11.5
Resolves: #98459
Change-Id: I49d5d98484612921c02746bcf75c9dfc2bef526c
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/75884


Tested-by: core-ci <typo3@b13.com>
Tested-by: Benni Mack <benni@typo3.org>
Tested-by: Stefan Bürk <stefan@buerk.tech>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Benni Mack <benni@typo3.org>
Reviewed-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Reviewed-by: Stefan Bürk <stefan@buerk.tech>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>