Fix test failures on testBusinessTemplate and spurious error messages on the console when trying to set the sort_key on an unconnected Connection object. Also fix the manual creation of the ActivityConnection object.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@41865 20353a03-c40f-0410-a6d1-a30d3c3de9de