Fix spell-checking email message with citations

This became broken 7 years ago, when the 'boundp condition was
removed, and with it an important unrelated part of the code.
* lisp/textmodes/ispell.el (ispell-message): Fix cite-regexp.

diff --git a/lisp/textmodes/ispell.el b/lisp/textmodes/ispell.el
index eb550b639a3cc43adedd0e448c88929dea4e2d0b..48d48b07937676e24296ae7d2ae976cc95b4dc62 100644 (file)
--- a/lisp/textmodes/ispell.el
+++ b/lisp/textmodes/ispell.el
@@ -3973,7 +3973,8 @@ You can bind this to the key C-c i in GNUS or mail by adding to
                       (point-max)))
                    (t (min (point-max) (funcall ispell-message-text-end))))))
           (default-prefix   ; Vanilla cite prefix (just used for cite-regexp)
-            (if (ispell-non-empty-string mail-yank-prefix)
+            (if mail-yank-prefix
+                 (ispell-non-empty-string mail-yank-prefix)
               "   \\|\t"))
           (cite-regexp                 ;Prefix of quoted text
            (cond