[PATCH] Fix 'svn export -rBASE' bug

[John Szakmeister <jo...@szakmeister.net>]

Hey Guys,

It's been a while since I've done some Subversion development, so I 
decided to indulge myself after a change in jobs.

Here's a patch to fix the case when a file/directory has been added to the 
working copy and 'svn export -rBASE' is run on it.  It would attempt to 
export the new files even though they didn't exist in the base revision.  
This patch fixes that problem.

I'm posting it here for review, since I haven't committed anything in 
quite some time.

-John