mininal fix for disabled tab2 items, fixes #4033


git-svn-id: svn://develop.studip.de/studip/trunk@28774 c5b85792-5220-0410-ad23-ed5b6b8ad999
don't clear environment for java call, remove tmp file, fixes #4055


git-svn-id: svn://develop.studip.de/studip/trunk@28775 c5b85792-5220-0410-ad23-ed5b6b8ad999