don't fail if portal type not found when installing roles

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@6487 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/Document/BusinessTemplate.py

@@ -1897,7 +1897,8 @@ class PortalTypeRolesTemplateItem(BaseTemplateItem):
           if action == 'nothing':
             continue
       path = 'portal_types/%s' % roles_path.split('/', 1)[1]
-      obj = p.unrestrictedTraverse(path)
+      obj = p.unrestrictedTraverse(path, None)
+      if obj is not None:
         setattr(obj, '_roles', []) # reset roles before applying
         type_roles_list = self._objects[roles_path] or []
         for type_role_property_dict in type_roles_list: