Fix creation of parent nodes when refiling.

* org.el (org-refile-get-location): Check for a refile
position when the position is not nil, otherwise allow to
create the parent node if the user requests it.

Thanks to Li Zhuo for reporting this bug and for providing
a preliminary patch.

lisp/org.el

@@ -11705,9 +11705,9 @@ this is used for the GOTO interface."
     (setq answ (funcall cfunc prompt tbl nil (not new-nodes)
 			nil 'org-refile-history (or cdef (car org-refile-history))))
     (setq pa (or (assoc answ tbl) (assoc (concat answ "/") tbl)))
-    (org-refile-check-position pa)
     (if pa
 	(progn
+	  (org-refile-check-position pa)
 	  (when (or (not org-refile-history)
 		    (not (eq old-hist org-refile-history))
 		    (not (equal (car pa) (car org-refile-history))))