Fix 0003231: Redirect problem when user clicks on a bug link while not logged in.

M core/access_api.php

• (access_denied): Do not echo "access denied" message if user is not logged in and is to be redirected to login screen.
  1. It didn't make much sense
  2. Sometimes the redirect didn't work because of the message.

Thanks to J.P. Pasnak for the fix.

git-svn-id: http://mantisbt.svn.sourceforge.net/svnroot/mantisbt/trunk@2185 <a class="text" href="/?p=mantisbt.git;a=object;h=f5dc347c">f5dc347c</a>-c33d-0410-90a0-b07cc1902cb9