[TASK] Simplify a condition in GU::intExplode

For strings, `trim($value) === ''` will always be true for empty strings.
So an additional check for `$value` being empty is not needed.

Resolves: #99897
Releases: main
Change-Id: Id280cbaac38bd98447d087126025616b9379d722
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/77801


Tested-by: Jörg Bösche <typo3@joergboesche.de>
Reviewed-by: Nikita Hovratov <nikita.h@live.de>
Tested-by: core-ci <typo3@b13.com>
Reviewed-by: Jörg Bösche <typo3@joergboesche.de>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Nikita Hovratov <nikita.h@live.de>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>