[mew-dist 20692] wrong-type-argument when `o'

[Tatsuya Kinoshita]

anoncvs版で、`o'の際にエラーになる場合がある(refile-guessの結果が
nilだとwrong-type-argumentになる)のを修正しました。

-- 
木下達也
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 This patch is written by Tatsuya Kinoshita.  Copyright is disclaimed.

diff -ur mew.orig/mew-minibuf.el mew/mew-minibuf.el
--- mew.orig/mew-minibuf.el	Wed Mar 27 23:03:40 2002
+++ mew/mew-minibuf.el	Sat Mar 30 16:43:49 2002
@@ -88,7 +88,7 @@
       (setq proto (mew-folder-prefix init)))
      (t
       (setq prompt (format "Folder name (%s): " default))
-      (setq init (mew-folder-prefix default))
+      (setq init (mew-folder-prefix (or default mew-inbox-folder)))
       (setq proto init)))
     (mew-input-clear)
     (setq mew-input-complete-function (function mew-complete-folder))