Allow existing comment on role to differ

greg/management/commands/import_guests.py

@@ -162,8 +162,8 @@ class Command(BaseCommand):
                 orgunit=orgunit,
                 person=person,
                 type=role_type,
-                comments=role_data["comment"],
             )
+            role.comments = role_data["comment"],
             role.end_date = self._end_date
             role.save()
             logger.info("updating_existing_role", role=role, sponsor=role.sponsor)