[BUGFIX] Avoid undefined array key access in DataMapFactory

In two places \TYPO3\CMS\Extbase\Persistence\Generic\Mapper\DataMapFactory
accesses the TCA for some table without checking if it exists.

Resolves: #97853
Releases: main, 11.5
Change-Id: I02c46153013c920cc771f085f872004e9a22ab3c
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/75025


Tested-by: core-ci <typo3@b13.com>
Tested-by: Simon Schaufelberger <simonschaufi+typo3@gmail.com>
Tested-by: Markus Klein <markus.klein@typo3.org>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>
Reviewed-by: Simon Schaufelberger <simonschaufi+typo3@gmail.com>
Reviewed-by: Markus Klein <markus.klein@typo3.org>
Reviewed-by: Benni Mack <benni@typo3.org>