[BUGFIX] Prevent undefined array offset warnings in ElementInformationController

Resolves: #99468
Releases: main, 11.5
Change-Id: Ib22901dce1662a0216eb4e2a55061131055fbcf1
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/77219


Tested-by: core-ci <typo3@b13.com>
Tested-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Oliver Bartsch <bo@cedev.de>