select_test was wrong because only RelationStringField may have this test false, RelationStringField are conposed eventualy by a select struct and at least 2 input structs).
The problem was ListFieds (composed by a select) match with this test (and should not) and so, ListFields were rendering as special multi-fields (so the css class was wrong and the field was not visible). Now they are rendered like standard multi-input fields, and works.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@20300 20353a03-c40f-0410-a6d1-a30d3c3de9de