(excepts that it acquires the value from parent, which is wrong here) -> remove MappedValue.getProperty.
Also remove MappedValue.setProperty which has been commented out some times
ago for similar reasons



git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@20844 20353a03-c40f-0410-a6d1-a30d3c3de9de