bug#13234: [24.2.91] nnimap-find-article-by-message-id can't handle group == nil

[Andreas Schwab]

Debugger entered--Lisp error: (wrong-type-argument stringp nil)
  encode-coding-string(nil utf-7-imap)
  utf7-encode(nil t)
  nnimap-find-article-by-message-id(nil 
"<Pine.BSM.4.64L.1212191326530.16336@herc.mirbsd.org>")
  nnimap-request-head("<Pine.BSM.4.64L.1212191326530.16336@herc.mirbsd.org>" 
nil "mnet")
  gnus-request-head("<Pine.BSM.4.64L.1212191326530.16336@herc.mirbsd.org>" 
"nnimap+mnet:INBOX")
  gnus-read-header("<Pine.BSM.4.64L.1212191326530.16336@herc.mirbsd.org>")
  
gnus-summary-insert-subject("<Pine.BSM.4.64L.1212191326530.16336@herc.mirbsd.org>")
  byte-code("\304 \305.\211.\203-.      
@.\306!\203&.\307\n!\211.\203&.\310\305\211\211$\210\311\312\313\"\210        
A\211.\204      .*\314\315\316\n#\207" [gnus-override-method --dolist-tail-- 
message-id number gnus-refer-article-methods nil gnus-check-server 
gnus-summary-insert-subject gnus-summary-select-article throw found t 
gnus-message 3 "Couldn't fetch article %s"] 6)
  
gnus-summary-refer-article("<Pine.BSM.4.64L.1212191326530.16336@herc.mirbsd.org>")
  gnus-summary-refer-parent-article(1)
  call-interactively(gnus-summary-refer-parent-article nil nil)

See also
<http://git.gnus.org/cgit/gnus.git/commit/?id=8ba1cd0b96466a96265ec5336728519aa6030d83>.

Andreas.

-- 
Andreas Schwab, schwab@linux-m68k.org
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5
"And now for something completely different."