[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/+/82269


Reviewed-by: Nikita Hovratov <nikita.h@live.de>
Reviewed-by: Stefan Bürk <stefan@buerk.tech>
Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>
Tested-by: Stefan Bürk <stefan@buerk.tech>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Nikita Hovratov <nikita.h@live.de>
Tested-by: Simon Schaufelberger <simonschaufi+typo3@gmail.com>
Reviewed-by: Simon Schaufelberger <simonschaufi+typo3@gmail.com>