@@ -, +, @@ 
------------------------------------------------------------------------
--- trac/util/translation.py	(revision 11683)
+++ trac/util/translation.py	(revision 11684)
@@ -337,7 +337,9 @@ 
         try:
             return [dirname for dirname
                     in pkg_resources.resource_listdir('trac', 'locale')
-                    if '.' not in dirname]
+                    if '.' not in dirname
+                    and pkg_resources.resource_exists(
+                    'trac', 'locale/%s/LC_MESSAGES/messages.mo' % dirname)]
         except Exception:
             return []
 
------------------------------------------------------------------------