Make the optional describe-map-tree parameters optional

* lisp/help.el (describe-map-tree): Make the optional parameters
optional.  This makes testing easier.

diff --git a/lisp/help.el b/lisp/help.el
index 68b6d930c9aebc141e4be1a16b471fab88b64911..bc3d4773dad9c37a3c0b6f2702eae1430d463dd2 100644 (file)
--- a/lisp/help.el
+++ b/lisp/help.el
@@ -1226,8 +1226,8 @@ Otherwise, return a new string."
         (buffer-string)))))
 
 (defvar help--keymaps-seen nil)
-(defun describe-map-tree (startmap partial shadow prefix title no-menu
-                                   transl always-title mention-shadow)
+(defun describe-map-tree (startmap &optional partial shadow prefix title
+                                   no-menu transl always-title mention-shadow)
   "Insert a description of the key bindings in STARTMAP.
 This is followed by the key bindings of all maps reachable
 through STARTMAP.