[BUGFIX] Prevent undefined array key in UserIntInformation

Resolves: #100742
Releases: main, 11.5
Change-Id: Ibff1f2da48192a23d3fe6e5404c95f3b7e6c8ae8
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/78852


Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: core-ci <typo3@b13.com>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>