there is already a method for getting state of bt

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@21729 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5Type/DocumentationHelper/ERP5SiteDocumentationHelper.py

@@ -87,9 +87,7 @@ class ERP5SiteDocumentationHelper(DocumentationHelper):
     bt_list = []
     for bt in self.getDocumentedObject().portal_templates.objectValues():
       current_state = ''
-      for wh in bt.workflow_history['business_template_installation_workflow']:
-        current_state = wh['installation_state']
-      if current_state == 'installed':
+      if bt.getInstallationState() == 'installed':
         bt_list.append(bt.getId())
     return bt_list