Do not attempt to fetch mail for mailbox not having a URI.

--HG--
branch : exim4_pipe

django_mailbox/management/commands/getmail.py

@@ -8,6 +8,8 @@ class Command(BaseCommand):
         if args:
             mailboxes = mailboxes.filter(name = ' '.join(args))
         for mailbox in mailboxes:
+            if not mailbox.uri:
+                continue
             self.stdout.write('Gathering messages for %s\n' % mailbox.name)
             messages = mailbox.get_new_mail()
             for message in messages: