[BUGFIX] Check if titleText is available in classesAnchor RTE config

Resolves: #98273
Releases: main, 11.5
Change-Id: I521d855fb4dc8fbafb302de16f8d446abfb4d9e1
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/75636


Tested-by: core-ci <typo3@b13.com>
Tested-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Reviewed-by: Andreas Fernandez <a.fernandez@scripting-base.de>