Changed the way seed stock variate is read from Description sheet in Germplasm Import file

Ticket: GCP-9843

Reviewer: Dennis
Merge branch 'master' into germplasm_import_refactoring
Added Handling of Attribute Variates in Germplasm Import

GCP-9753

Reviewer: Darla
Handles the case when the user don't add any attribute variate at all.

GCP-9753

Reviewer: Aldrin
Merge branch 'germplasm_import_refactoring'