Separator unparsed even when dfdl:occursCount expression is zero

See the attached schema, and the following data

Year,Make,Model,Description,Price
1997,Ford,E350,"ac, abs, moon",2999.99
1999,Chevy,Venture Extended Edition,,4900.00
1999,Chevy,Venture Extended Edition,Very Large,5000.00
1996,Jeep,Grand Cherokee,"MUST SELL! air, moon roof, loaded",4799.00

If the 'header' variable is set to "none" then this schema correctly does not create a <header> element because occursCount evaluates to 0. However, on unparse even though there is no header element, Daffodil still creates a separator, causing an empty newline to be output as the first line.