- For the call to _findPredicateList, explicitely check the length of objects
  (instead of trying __nonzero__ first, which is wrong and slow).
- Do not allow to call asComposedDocument on a composed document for the moment.
- Make internal class private and fix __name__ of asComposedDocument method.
- Fix test_tradeModelLineWithTargetLevelSetting

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@34265 20353a03-c40f-0410-a6d1-a30d3c3de9de