[BUGFIX] Fix fatal error in SpacelessViewHelper

Resolves: #71676
Releases: master
Change-Id: I6e8943809b866ca354d0f264df8069fb630705e1
Reviewed-on: https://review.typo3.org/44794


Reviewed-by: Markus Klein <markus.klein@typo3.org>
Tested-by: Markus Klein <markus.klein@typo3.org>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Nicole Cordes <typo3@cordes.co>
Tested-by: Nicole Cordes <typo3@cordes.co>