refine check for correct path re #3539

git-svn-id: svn://develop.studip.de/studip/trunk@27531 c5b85792-5220-0410-ad23-ed5b6b8ad999
remove wrong entries during migration re #2931

git-svn-id: svn://develop.studip.de/studip/trunk@27532 c5b85792-5220-0410-ad23-ed5b6b8ad999