[BUGFIX] Prevent TypeError in SystemInformationMenu

In some cases the element might not be available,
making the  data attributes not accessible. To
prevent type errors, proper checks are added.

Resolves: #102510
Releases: main, 12.4
Change-Id: I061fcb3fe4f153ff45230a86ed11edf1dfb76cd8
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/81906


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