Project Importers maDMP - Duplicates Contributor with Role "Contact Person"

[jmartinkova]

Steps how to reproduce:
In project A (Root KM) create a contributor with the role "Contact Person" and at least one additional role.
Export the data using the maDMP document template.
Import the data via maDMP to different project B (Root KM).

Actual Result:
The contributor appears twice in the project contributors list.
One entry includes only the "Contact Person" role.
The other entry includes all assigned roles, including "Contact Person."

Expected Result:
Each contributor should appear as a single entry, consolidating all assigned roles under one record.