task csv-to-oscal-cd should not ignore $Check_Id and $Check-Description when value is: na

[degenaro]

Issue description / feature objectives

When component type is validation, the $Check_Id and $Check_Description cells must be present.

Sometimes there may be no check, for example data is provided by Auditree. In this case, as always, the $Rule_Id should be present but the $Check_Id and $Check_Description can be absent, indicated by a value of na (or n/a) in any (upper/lower/mixed) case.

Caveats / Assumptions

None.

Completion Criteria

Test coverage validates functionality.