• remove a project's row from the cache when it is deleted
• cache the project row while checking if it exists (thanks vb for the original suggestion)

git-svn-id: http://mantisbt.svn.sourceforge.net/svnroot/mantisbt/trunk@1362 <a class="text" href="/?p=mantisbt.git;a=object;h=f5dc347c">f5dc347c</a>-c33d-0410-90a0-b07cc1902cb9