[gjs] Fix error message if property not found in DBus.conformExport.

[C. Scott Ananian <cananian src gnome org>]

commit d0888e1318d1393c6a2861a5069deea42a42b42c
Author: C. Scott Ananian <cscott litl com>
Date:   Thu Apr 23 16:44:41 2009 -0400

    Fix error message if property not found in DBus.conformExport.
---
 modules/dbus.js |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/modules/dbus.js b/modules/dbus.js
index c98aa6d..ea5a98c 100644
--- a/modules/dbus.js
+++ b/modules/dbus.js
@@ -544,7 +544,7 @@ function conformExport(object, iface) {
         let missing = [];
         for (let i = 0; i < properties.length; ++i) {
             if (!(properties[i].name in object)) {
-                missing += properties[i];
+                missing.push(properties[i]);
             }
         }