- As there is only one case where something is appended to sql_expr, use a list comprehension.
 - Factorise UID rendering (Note: none_sql_value is accessed on parent namespace).
Add a comment about aparently useless code which cannot be safely removed.


git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@22033 20353a03-c40f-0410-a6d1-a30d3c3de9de