nnimap-demule shouldn't be called with nil

nnimap-demule shouldn't be called with nil

[Naohiro Aota]

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Hi, list.

In some situations, Gnus call `nnimap-demule' with nil, and cause an
error: "insert: Wrong type argument: stringp, nil". This makes
`gnus-summary-prev-article' stop working in the situations.

Anyway, I wrote a patch for this. Please find the patch below.

2008-12-12  Naohiro Aota  <nao.aota@gmail.com>

	* nnimap.el (nnimap-request-article-part): Call nnimap-demule with
	empty string, when data is nil.


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Index: lisp/nnimap.el
===================================================================
RCS file: /usr/local/cvsroot/gnus/lisp/nnimap.el,v
retrieving revision 7.55
diff -u -r7.55 nnimap.el
--- lisp/nnimap.el	3 Dec 2008 20:33:34 -0000	7.55
+++ lisp/nnimap.el	12 Dec 2008 02:11:50 -0000
@@ -950,9 +950,10 @@
 	      (erase-buffer)
 	      (let ((data (imap-fetch article part prop nil
 				      nnimap-server-buffer)))
-		(insert (nnimap-demule (if detail
-					   (nth 2 (car data))
-					 data))))
+		(insert (nnimap-demule (or (if detail
+					       (nth 2 (car data))
+					     data)
+					   ""))))
 	      (nnheader-ms-strip-cr)
 	      (gnus-message
 	       10 "nnimap: Fetching (part of) article %d from %s...done"

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Regards,