Even if you have mapped the primary addressee and primary salutation values in the constituent mapping, it may still be the case that Importacular will complain that the primary addressee is a blank field. Why is this?
If you select a primary addressee or salutation that only references the spouse and there is no spouse record then the resolved addressee or salutation will be blank. For example if you select the template:
[Spouse title] [Spouse last name] then this will resolve as blank if there is no spouse.
Equally if you select
[First name]
and there the first name is blank then this will also cause the same error.