[BUGFIX] Avoid PHP warning when checking TCA hideTable

Resolves: #102713
Releases: main, 12.4, 11.5
Change-Id: I18c841d9085221f4b6ff826600965b159af7971b
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/82246


Tested-by: core-ci <typo3@b13.com>
Tested-by: Nikita Hovratov <nikita.h@live.de>
Reviewed-by: Nikita Hovratov <nikita.h@live.de>