organization display_name set to empty string by civicrm_contact_add()

If civicrm_contact_add() is used to update an organization contact, the organization's display_name will be set to empty string unless the organization_name or display_name is explicitly set in the $params. I do not, however, want to have to specify all org fields in the civicrm_contact_add() $params.

Passing a full $organization array into civicrm_contact_add() will cause other problems, such as an extra row appearing in the civicrm_email table (duplicate location is created).