removed ob_clean call. Clearing the buffer may make for a nicer error message but it totally destroys any debug output. Think of a better way if a pretty error must be displayed.

git-svn-id: http://mantisbt.svn.sourceforge.net/svnroot/mantisbt/trunk@1423 <a class="text" href="/?p=mantisbt.git;a=object;h=f5dc347c">f5dc347c</a>-c33d-0410-90a0-b07cc1902cb9