[BUGFIX] Avoid notice in TcaInline when ['ctrl']['transOrigPointerField'] is empty

Resolves: #103596
Related: #97548
Releases: main, 12.4

Change-Id: I2384d223202af1575a93497f81e6a69599ebbc3c
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/83740


Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: core-ci <typo3@b13.com>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Jörg Bösche <typo3@joergboesche.de>