[BUGFIX] Ensure PageRouter only operates with previous result

If no previous result given, an exception should be thrown,
instead of a PHP error.

Resolves: #88133
Releases: master, 9.5
Change-Id: I708e735e664589b0fc8d125a60b9970128b584af
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/60474


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Dmitry Dulepov
Tested-by: Susanne Moog <look@susi.dev>
Reviewed-by: Dmitry Dulepov
Reviewed-by: Susanne Moog <look@susi.dev>