the site from anywhere.
Also setSite() in places where the published object is not in the site
or before an ERP5 site installation: this is required for portal types
as classes in 2.12 as PARENTS is not anymore there in the request.

If some traces appear in the logs for 2.12 instances, the proper fix
is to add a setSite() in the codepath leading to the point using getSite()


git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@38613 20353a03-c40f-0410-a6d1-a30d3c3de9de