[BUGFIX] Introduction package fails in DataMapProcessor

Change-Id: Icf785d1c79d739fff70aeed8e7745cfedc3993ac
Resolves: #80676
Releases: master
Reviewed-on: https://review.typo3.org/52357


Reviewed-by: Susanne Moog <susanne.moog@typo3.org>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Thomas Hohn <thomas@hohn.dk>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: TYPO3com <no-reply@typo3.com>
Tested-by: Frans Saris <franssaris@gmail.com>
Reviewed-by: Benni Mack <benni@typo3.org>
Tested-by: Benni Mack <benni@typo3.org>