Allow global-edebug-prefix to be nil

* lisp/emacs-lisp/edebug.el (global-edebug-prefix): Allow
global-edebug-prefix to be nil (if the user doesn't want that
prefix) (bug#25188).

diff --git a/lisp/emacs-lisp/edebug.el b/lisp/emacs-lisp/edebug.el
index 717026995a383167fbb4a22d792c772fb025c5b7..cd709c77b30dec7d075b172ef1e5885fa600a49b 100644 (file)
--- a/lisp/emacs-lisp/edebug.el
+++ b/lisp/emacs-lisp/edebug.el
@@ -3748,8 +3748,9 @@ be installed in `emacs-lisp-mode-map'.")
     map)
   "Global map of edebug commands, available from any buffer.")
 
-(global-unset-key global-edebug-prefix)
-(global-set-key global-edebug-prefix global-edebug-map)
+(when global-edebug-prefix
+  (global-unset-key global-edebug-prefix)
+  (global-set-key global-edebug-prefix global-edebug-map))
 
 
 (defun edebug-help ()