Fix ERP5Site.getSite when the root folder is not activated

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@38727 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/ERP5Site.py

@@ -195,8 +195,7 @@ class _site(threading.local):
     XXX The returned site is not wrapped in a request.
     """
     app, site_id = self.site[-1]
-    app = app()
-    return CMFSite.__of__(app.__dict__[site_id], app)
+    return getattr(app(), site_id)
 
   def __set(self, site):
     app = aq_base(site.aq_parent)