[TASK] Use null coalescing operator for userfunction's configuration

Call the user functions with an empty array instead of null as 2nd
argument.

Resolves: #93513
Releases: master, 10.4
Change-Id: Ibc50b9e3ec7defc0100e5ae6447b05fca8e77cd7
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/68168


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Markus Klein <markus.klein@typo3.org>
Tested-by: Oliver Bartsch <bo@cedev.de>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Markus Klein <markus.klein@typo3.org>
Reviewed-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Benni Mack <benni@typo3.org>