when no Base Type is defined in TypesTool.

This should ensure that newTempXXX calls succeed, without needing abstract Base
Type objects, *if* the Document correctly defines portal_type attribute on the
Document class.


git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@39461 20353a03-c40f-0410-a6d1-a30d3c3de9de