Fix mantis 2908: finally get "richer" pilot conversion exceptions data working correctly
THANK YOU Tony D @stackoverflow!
http://stackoverflow.com/questions/6248404/c-exceptions-is-throwing-c-string-as-an-exception-bad

git-svn-id: svn://svn.icculus.org/fs2open/trunk/fs2_open@9747 387891d4-d844-0410-90c0-e4c51a9137d3