[gnome-shell] Reverting "extensionUtils: Remove unused property"

[Jasper St. Pierre <jstpierre src gnome org>]

commit 783abd4f5f7bf98cd79bb6dd9811d662d2ce4ce5
Author: Jasper St. Pierre <jstpierre mecheye net>
Date:   Thu Dec 13 14:16:21 2012 -0500

    Reverting "extensionUtils: Remove unused property"
    
    This reverts commit 28aa9201f006534f4aac4b402e9137af3fcba930.
    
    This broke the extension-state-changed signal.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=690173

 js/misc/extensionUtils.js |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/js/misc/extensionUtils.js b/js/misc/extensionUtils.js
index b7b6282..9e70e26 100644
--- a/js/misc/extensionUtils.js
+++ b/js/misc/extensionUtils.js
@@ -132,6 +132,7 @@ function createExtensionObject(uuid, dir, type) {
     extension.type = type;
     extension.dir = dir;
     extension.path = dir.get_path();
+    extension.error = '';
     extension.hasPrefs = dir.get_child('prefs.js').query_exists(null);
 
     extensions[uuid] = extension;