CLDC-3330: Use partial postcodes in bulk upload

app/services/bulk_upload/lettings/year2024/row_parser.rb

@@ -1355,7 +1355,7 @@ private
   end
 
   def postcode_full
-    "#{field_21} #{field_22}" if field_21 && field_22
+    "#{field_21} #{field_22}" if field_21 || field_22
   end
 
   def owning_organisation

app/services/bulk_upload/sales/year2024/row_parser.rb

@@ -1074,7 +1074,7 @@ private
   end
 
   def postcode_full
-    "#{field_27} #{field_28}" if field_27 && field_28
+    "#{field_27} #{field_28}" if field_27 || field_28
   end
 
   def ppostcode_full

spec/services/bulk_upload/lettings/year2024/row_parser_spec.rb

@@ -2718,6 +2718,14 @@ RSpec.describe BulkUpload::Lettings::Year2024::RowParser do
       it "strips whitespace" do
         expect(parser.log.postcode_full).to eql("EC1N 2TD")
       end
+
+      context "when a partial postcode is provided" do
+        let(:attributes) { { bulk_upload:, field_4: 1, field_21: "EC1N", field_22: nil } }
+
+        it "is set to the partial value" do
+          expect(parser.log.postcode_full).to eql("EC1N")
+        end
+      end
     end
 
     describe "#la" do