[extensions-web] Don't mark extensions without a shell version map incompatible

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

commit 149665b34211ce56ceccbca61def3e28ced6840f
Author: Jasper St. Pierre <jstpierre mecheye net>
Date:   Fri Dec 9 11:59:17 2011 -0500

    Don't mark extensions without a shell version map incompatible

 sweettooth/static/js/extensions.js |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/sweettooth/static/js/extensions.js b/sweettooth/static/js/extensions.js
index a7d80ad..8f04fcd 100644
--- a/sweettooth/static/js/extensions.js
+++ b/sweettooth/static/js/extensions.js
@@ -300,6 +300,9 @@ function($, messages, dbusProxy, extensionUtils) {
 
     $('li.extension').each(function() {
         var svm = $(this).data('svm');
+        if (svm === null)
+            return;
+
         var vpk = extensionUtils.grabProperExtensionVersion(svm, dbusProxy.ShellVersion);
         if (vpk === null) {
             $(this).addClass('out-of-date').attr('title', "This extension is incompatible with your version of GNOME").tipsy({ gravity: 's', fade: true });