(calc-quit): Make sure that the keypad buffer exists before delete its windows.

lisp/ChangeLog

+2008-11-04  Jay Belanger  <jay.p.belanger@gmail.com>
+
+	* calc/calc.el (calc-quit): Make sure that the keypad buffer
+	exists before deleting its windows.
+
 2008-11-04  Chong Yidong  <cyd@stupidchicken.com>
 
 	* server.el (server-process-filter): Don't call

lisp/calc/calc.el

@@ -1431,7 +1431,7 @@ commands given here will actually operate on the *Calculator* stack."
             (setq calc-window-height (- (window-height win) 2)))
         (progn
           (delete-windows-on buf)
-          (delete-windows-on kbuf))
+          (and kbuf (delete-windows-on kbuf)))
         (bury-buffer buf)
         (bury-buffer calc-trail-buffer)
         (and kbuf (bury-buffer kbuf))))))