(mouse-yank-secondary): Better error message if no secondary selection.

lisp/ChangeLog

+2007-07-13  Drew Adams  <drew.adams@oracle.com>
+
+	* mouse.el (mouse-yank-secondary): Better error message if no
+	secondary selection.
+
 2007-07-16  Dan Nicolaescu  <dann@ics.uci.edu>
 
 	* vc-hooks.el (vc-handled-backends): Move BZR later in the list.

lisp/mouse.el

@@ -1631,7 +1631,10 @@ regardless of where you click."
   ;; Give temporary modes such as isearch a chance to turn off.
   (run-hooks 'mouse-leave-buffer-hook)
   (or mouse-yank-at-point (mouse-set-point click))
-  (insert (x-get-selection 'SECONDARY)))
+  (let ((secondary (x-get-selection 'SECONDARY)))
+    (if secondary
+        (insert (x-get-selection 'SECONDARY))
+      (error "No secondary selection"))))
 
 (defun mouse-kill-secondary ()
   "Kill the text in the secondary selection.