• core/error_api.php
  (error_handler): missed an instance of a string needing htmlentities().
  Also, just apply it once to the variable instead of each time it is
  displayed.

git-svn-id: http://mantisbt.svn.sourceforge.net/svnroot/mantisbt/trunk@1805 <a class="text" href="/?p=mantisbt.git;a=object;h=f5dc347c">f5dc347c</a>-c33d-0410-90a0-b07cc1902cb9