uncaught archiver exception [PATCH]

I encountered an exception in the HyperArch module
while rebuilding the pipermail archives of one of my
mailing lists. The error is a simple missing 'import'
at the top of the file.

Mailman.Archiver.HyperArch.Article._open_list (line 332
in 2.1.4) reads:

            except Errors.MMListError, e:

but that module fails to import Mailman.Errors, so I
get a NameError at this point. I'm not sure why it
doesn't happen all the time: perhaps that code is only
executed when you're manually rebuilding the archives
or something.

It looks like this bug still exists in CVS. I've
attached the one-liner patch to fix it.

thanks,
 -Brian

[http://sourceforge.net/tracker/index.php?func=detail&aid=1000304&group_id=103&atid=100103]