[BUGFIX] Prevent null pointer exception in LocalizationUtility

Resolves: #91345
Releases: master
Change-Id: I54ab67e85b3bf24b06916b674765ed22fb5de76c
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/64508


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Josef Glatz <josefglatz@gmail.com>
Tested-by: Daniel Goerz <daniel.goerz@posteo.de>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>
Reviewed-by: Josef Glatz <josefglatz@gmail.com>
Reviewed-by: Daniel Goerz <daniel.goerz@posteo.de>