[FIX] mail.js: now giving an undefined (None) ids in message_read instead of a void list.

bzr revid: tde@openerp.com-20121029095047-k8ahahmuq6z4b9tv

addons/mail/static/src/js/mail.js

@@ -1409,7 +1409,7 @@ openerp.mail = function (session) {
                 'show_record_name' : false,
                 'show_compose_message' : false,
                 'show_compact_message' : false,
-                'message_ids': [],
+                'message_ids': undefined,
                 'no_message': false
             }, options);