bug in gnus nnimap expiry in emacs21

[Ken Raeburn]

Gnus v5.9.0
GNU Emacs 21.0.104.2 (i386-debian-linux-gnu, X toolkit)
 of 2001-07-13 on peppermint

(This is a packaged emacs21 by one of the Debian testers; I don't know
of any changes from the snapshots or CVS, but can't assert that there
aren't any.)

If I start up gnus with my current settings, while disconnected from
the net, the nnimap:cyrus.andrew.cmu.edu server gets denied.  Running
gnus-group-expire-all-groups causes a lisp error when expiring groups
from that server, because set-buffer is called with
nnimap-server-buffer, which is nil.

I don't have any time to look further into it this week or next.

Debugger entered--Lisp error: (wrong-type-argument stringp nil)
  set-buffer(nil)
  (save-current-buffer (set-buffer nnimap-server-buffer) (when (and ... ...) 
(case nnimap-expunge-on-close ... ... ...) (not imap-current-mailbox)))
  (with-current-buffer nnimap-server-buffer (when (and ... ...) (case 
nnimap-expunge-on-close ... ... ...) (not imap-current-mailbox)))
  nnimap-close-group("archive.openafs.openafs-announce" "cyrus.andrew.cmu.edu")
  
gnus-close-group("nnimap+cyrus.andrew.cmu.edu:archive.openafs.openafs-announce")
  
gnus-group-expire-articles-1("nnimap+cyrus.andrew.cmu.edu:archive.openafs.openafs-announce")
  gnus-group-expire-articles(nil)
  gnus-group-expire-all-groups()
  call-interactively(gnus-group-expire-all-groups)

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