[TASK] Throw explicit exception on missing link handler class

This adds the link handler identifier to the error message which
makes it easier to fix the missing class reference.

Resolves: #81205
Releases: master, 8.7, 7.6
Change-Id: I0ce610f7ec167704d5cbc5de20d43639c18e3fc1
Reviewed-on: https://review.typo3.org/52787


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Elmar Hinz <t3elmar@gmail.com>
Reviewed-by: Henrik Elsner <helsner@dfau.de>
Tested-by: Henrik Elsner <helsner@dfau.de>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>