CLDC-1941 Only add existing location and scheme fields to the export (#1279)

* Only add location and scheme fields to the export if the location and scheme exists

* Add supported housing as one of the logs in export tests

app/services/exports/lettings_log_export_service.rb

@@ -198,8 +198,8 @@ module Exports
         attribute_hash["sheltered"] = lettings_log.sheltered
         attribute_hash["nocharge"] = lettings_log.household_charge == 1 ? 1 : nil
         attribute_hash["chcharge"] = lettings_log.chcharge
-        add_scheme_fields!(lettings_log.scheme, attribute_hash)
-        add_location_fields!(lettings_log.location, attribute_hash)
+        add_scheme_fields!(lettings_log.scheme, attribute_hash) if lettings_log.scheme
+        add_location_fields!(lettings_log.location, attribute_hash) if lettings_log.location
         attribute_hash.delete("unittype_gn")
       end
       attribute_hash

spec/services/exports/lettings_log_export_service_spec.rb

@@ -127,7 +127,7 @@ RSpec.describe Exports::LettingsLogExportService do
 
     context "and multiple lettings logs are available for export on same quarter" do
       before do
-        FactoryBot.create(:lettings_log, startdate: Time.zone.local(2022, 2, 1))
+        FactoryBot.create(:lettings_log, startdate: Time.zone.local(2022, 2, 1), needstype: 2)
         FactoryBot.create(:lettings_log, startdate: Time.zone.local(2022, 3, 20))
       end