Index: modules/locale/locale.module
===================================================================
RCS file: /cvs/drupal/drupal/modules/locale/locale.module,v
retrieving revision 1.155
diff -u -p -r1.155 locale.module
--- modules/locale/locale.module	27 Dec 2006 13:11:59 -0000	1.155
+++ modules/locale/locale.module	10 Oct 2007 10:23:12 -0000
@@ -190,6 +190,9 @@ function locale($string) {
         $locale_t[$string] = $trans->translation;
         $string = $trans->translation;
       }
+      else {
+        $locale_t[$string] = TRUE;
+      }
     }
 
     // Either we have no such source string, or no translation