[BUGFIX] Avoid PHP warning in Extbase Workspace Overlays

Due to the fact that PageRepository->getRawRecord()
can return an array OR 0 (int) Typo3DbBackend must check
for an array in order to avoid a PHP warning.

Resolves: #94140
Releases: main, 11.5
Change-Id: Ib957bbfa20e8aac1b7b232f877bba74a7cfa6ff5
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/73085


Tested-by: core-ci <typo3@b13.com>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Benni Mack <benni@typo3.org>