[BUGFIX] Ensure proper value when accessing array

Even if the property 'crop' is not explicit set in the
TypoScript code provide expected values to the stdWrap
method (which expects a string and not NULL).

Resolves: #97720
Releases: main, 11.5
Change-Id: Id8039ea5e379aa9a3ed81499f90160a5af8546f3
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/74763


Tested-by: core-ci <typo3@b13.com>
Tested-by: Stefan Bürk <stefan@buerk.tech>
Reviewed-by: Stefan Bürk <stefan@buerk.tech>