Make description field required on the form

This field is set to required on DAO/xml but not on the form?

If this is left as blank, it prints a null string on the main page - see https://github.com/civicrm/org.civicrm.module.cividiscount/issues/248

This also stores "null" string in the line item table which displays the same on invoices, receipt, etc.

OR is this NOT meant to be required?