[TASK] EXT:form - allow <error /> and <mandatory /> outside of <label />

Allow <error /> and <mandatory /> tags outside of a <label /> tag.

Resolves: #70071
Releases: master
Change-Id: Ibac5445711bfe982e3f0c06bb239f4f2fbd66c0d
Reviewed-on: http://review.typo3.org/43525


Reviewed-by: Nicole Cordes <typo3@cordes.co>
Tested-by: Nicole Cordes <typo3@cordes.co>
Reviewed-by: Jan Helke <typo3@helke.de>
Tested-by: Jan Helke <typo3@helke.de>
Reviewed-by: Oliver Hader <oliver.hader@typo3.org>
Tested-by: Bjoern Jacob <bjoern.jacob@tritum.de>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>