Code review comment for lp://staging/~jelmer/loggerhead/fix-nick

Use Branch._get_nick(local=True) rather than Branch.get_config().get_nickname() as the latter may not be available in some implementations (read: svn).

With this patch and the other one I just submitted, it is possible to do things like:

serve-branches svn://svn.gnome.org/svn/gnome-specimen/trunk

and have that work.