Hello,

I'm using the master branch of the git version of gnus, and after
a recent update I have some problems when refiling messages. This is the
backtrace that I get:

Debugger entered--Lisp error: (wrong-type-argument stringp nil)
  string-match("^[^:]+:" nil)
  nnimap-retrieve-group-data-early("local" (nil))
  nnimap-request-group("old.lists.formal.2014.01" "local" nil nil)
  gnus-request-group("nnimap+local:old.lists.formal.2014.01")
  nnmail-expiry-target-group("nnimap+local:old.lists.formal.2014.01" "lists.formal")

`nnimap+local' is a local dovecot server (I refile messages that are
older than 1 year old locally):

#+begin_src emacs-lisp
(setq gnus-secondary-select-methods 
      '((nnimap 
         "local"
         (nnimap-address "localhost")
         (nnimap-server-port 143)
         (nnimap-stream network))))
#+end_src

Is this a bug with the recent imap changes?

Thanks,

Alan

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