Added a convenience method to get the message of a Throwable, or the class name if the message is null.
Added a convenience method to get the message of a Throwable, or the
class name if the message is null.


git-svn-id: 64ebf368729f38804935acb7146e017e0f909c6b@1875 6335cc39-0255-0410-8fd6-9bcaacd3b74c

samskivert/samskivert,samskivert/samskivert