Fix the previous mml patch better

* lisp/gnus/mml.el (mml-minibuffer-read-file): Fix the
previous patch in a better way (bug#20480).

diff --git a/lisp/gnus/mml.el b/lisp/gnus/mml.el
index 19c19deceddccc16dcb81990594b1e6e9889687c..a4a47f929f4440194a18f6280acad640328da89d 100644 (file)
--- a/lisp/gnus/mml.el
+++ b/lisp/gnus/mml.el
@@ -1249,13 +1249,12 @@ If not set, `default-directory' will be used."
 
 (defun mml-minibuffer-read-file (prompt)
   (let* ((completion-ignored-extensions nil)
+        (buffer-file-name nil)
         (file (read-file-name prompt
                               (or mml-default-directory default-directory)
-                              "" t)))
+                              nil t)))
     ;; Prevent some common errors.  This is inspired by similar code in
     ;; VM.
-    (when (zerop (length file))
-      (error "No file name entered"))
     (when (file-directory-p file)
       (error "%s is a directory, cannot attach" file))
     (unless (file-exists-p file)