[BUGFIX] Add null coalesce operator for stdWrapValue second parameter

In some setups the conf array is null and throws an error. This patch
adds the ?? operator with an empty array as fallback value.

Resolves: #92216
Related: #91657
Related: #91834
Releases: master
Change-Id: I95df9ad491f1284867a683a6980dbb1f6c3f3381
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/65618


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Reviewed-by: Benni Mack <benni@typo3.org>