fixes #4705

git-svn-id: svn://develop.studip.de/studip/trunk@31575 c5b85792-5220-0410-ad23-ed5b6b8ad999
fixed some things that were broken in last fix re #4609

git-svn-id: svn://develop.studip.de/studip/trunk@31576 c5b85792-5220-0410-ad23-ed5b6b8ad999
fixes #4705

git-svn-id: svn://develop.studip.de/studip/trunk@31577 c5b85792-5220-0410-ad23-ed5b6b8ad999