[BUGFIX] Undefined array key warning in static routes

When a creating a static route with a link
that does not contain a uid, php throws an undefined
array key warning.

This has been fixed by adding a fallback for pageuid.

Resolves: #97100
Releases: main, 11.5
Change-Id: I910d936b6e015378a2f6ccb4afbe9c9223ce9592
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/73781


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