StEP00249: fix fatal error if no institutes available, re #4486

git-svn-id: svn://develop.studip.de/studip/trunk@31067 c5b85792-5220-0410-ad23-ed5b6b8ad999
StEP00249: fix course number in course details, re #4484

git-svn-id: svn://develop.studip.de/studip/trunk@31068 c5b85792-5220-0410-ad23-ed5b6b8ad999