Fix ffap behavior in the Gnus group buffer (bug#35693)

* lisp/ffap.el (ffap-file-exists-string, ffap-file-at-point):
Don't recognize "" as a path or a file name (bug#35693).

1 files changed, 4 insertions, 1 deletions

diff --git a/lisp/ffap.el b/lisp/ffap.el
index bcb5efef544..08f72089450 100644
--- a/lisp/ffap.el
+++ b/lisp/ffap.el
@@ -513,7 +513,9 @@ When using jka-compr (a.k.a. `auto-compression-mode'), the returned
 name may have a suffix added from `ffap-compression-suffixes'.
 The optional NOMODIFY argument suppresses the extra search."
   (cond
-   ((not file) nil)                     ; quietly reject nil
+   ((or (not file)                      ; quietly reject nil
+        (zerop (length file)))          ; and also ""
+    nil)
    ((file-exists-p file) file)          ; try unmodified first
    ;; three reasons to suppress search:
    (nomodify nil)
@@ -1326,6 +1328,7 @@ which may actually result in an URL rather than a filename."
          ;; If it contains a colon, get rid of it (and return if exists)
          ((and (string-match path-separator name)
                (setq name (ffap-string-at-point 'nocolon))
+               (> (length name) 0)
                (ffap-file-exists-string name)))
          ;; File does not exist, try the alist:
          ((let ((alist ffap-alist) tem try case-fold-search)