[FOLLOWUP][TASK] Doctrine: migrate ext:impexp

Functionals found some issues, let's make them happy again ;)

Change-Id: Ie0314146ed8fe7a286a2c1e3cea186f4deeeafb6
Resolves: #76469
Releases: master
Reviewed-on: https://review.typo3.org/48508


Reviewed-by: Jan Helke <typo3@helke.de>
Tested-by: Jan Helke <typo3@helke.de>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>