[seda] Don't consider agency may be None in agency_id/name methods

since this is handled by the caller.

cubicweb_seda/entities/profile_generation.py

@@ -1103,10 +1103,10 @@ class SEDA1XSDExport(SEDA2ExportAdapter):
         return seq.title
 
     def agency_name(self, agency):
-        return agency.agency.dc_title() if agency and agency.agency else None
+        return agency.agency.dc_title() if agency.agency is not None else None
 
     def agency_id(self, agency):
-        return text_type(agency.agency.eid) if agency and agency.agency else None
+        return text_type(agency.agency.eid) if agency.agency is not None else None
 
     def archive_unit_content(self, archive_unit):
         return archive_unit.first_level_choice.content_sequence