Fix bug when there is no hast for id locations

Report by Gerald, fix by David Maus.

lisp/ChangeLog

@@ -1,5 +1,8 @@
 2010-02-26  Carsten Dominik  <carsten.dominik@gmail.com>
 
+	* org-id.el (org-id-find-id-file): Fix bug when there is no hash
+	table for the id locations.
+
 	* org.el (org-read-date-analyze): Match American-style dates, like
 	5/30 or 5/13/7.  Make sure cal-iso.el is loaded.  Don't force he
 	current year when reading ISO and American dates.

lisp/org-id.el

@@ -545,7 +545,9 @@ When CHECK is given, prepare detailed information about duplicate IDs."
 (defun org-id-find-id-file (id)
   "Query the id database for the file in which this ID is located."
   (unless org-id-locations (org-id-locations-load))
-  (or (gethash id org-id-locations)
+  (or (and org-id-locations
+	   (hash-table-p org-id-locations)
+	   (gethash id org-id-locations))
       ;; ball back on current buffer
       (buffer-file-name (or (buffer-base-buffer (current-buffer))
 			    (current-buffer)))))