Since both getMeasureRowList and getDefaultMeasure use the same getMeasureList,
if getDefaultMeasure returns a non-None measure, we _know_ that we will go
through that value in getMeasureRowList.
getDefaultMeasure == None <=> management_unit has to be inserted.


git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@30414 20353a03-c40f-0410-a6d1-a30d3c3de9de