Show error message when asking to match for nothing

* lisp/net/dictionary.el (dictionary-popup-matching-words): Show error
if neither the parameter nor the word at point are defined

This avoids an error later on when the nil value is used as string
within dictionary-encode-charset.

1 files changed, 1 insertions, 1 deletions

diff --git a/lisp/net/dictionary.el b/lisp/net/dictionary.el
index 12b11cb5111..d910dab1600 100644
--- a/lisp/net/dictionary.el
+++ b/lisp/net/dictionary.el
@@ -1179,7 +1179,7 @@ It presents the word at point as default input and allows editing it."
 (defun dictionary-popup-matching-words (&optional word)
   "Display entries matching the word at the point"
   (interactive)
-  (dictionary-do-matching (or word (current-word))
+  (dictionary-do-matching (or word (current-word) (error "Nothing to search for"))
                           dictionary-default-dictionary
                           dictionary-default-popup-strategy
                           'dictionary-process-popup-replies))