feat: use empty arrays

app/services/bulk_upload/lettings/year2023/row_parser.rb

@@ -893,10 +893,10 @@ private
       owning_organisation_id: [:field_1],
       managing_organisation_id: [:field_2],
       renewal: [:field_6],
-      scheme_id: (scheme_field.present? ? [scheme_field] : nil),
+      scheme_id: (scheme_field.present? ? [scheme_field] : []),
-      scheme: (scheme_field.present? ? [scheme_field] : nil),
+      scheme: (scheme_field.present? ? [scheme_field] : []),
-      location_id: (location_field.present? ? [location_field] : nil),
+      location_id: (location_field.present? ? [location_field] : []),
-      location: (location_field.present? ? [location_field] : nil),
+      location: (location_field.present? ? [location_field] : []),
       created_by: [:field_3],
       needstype: [:field_4],
       rent_type: %i[field_5 field_10 field_11],