Deal with bad SuppliedProduct data

engines/dfc_provider/app/controllers/dfc_provider/supplied_products_controller.rb

@@ -12,7 +12,10 @@ module DfcProvider
     end
 
     def create
-      supplied_product = import.first
+      supplied_product = import&.first
+
+      return head :bad_request unless supplied_product
+
       product = SuppliedProductBuilder.import(supplied_product)
       product.supplier = current_enterprise
       product.save!

engines/dfc_provider/spec/requests/supplied_products_spec.rb

@@ -63,6 +63,11 @@ describe "SuppliedProducts", type: :request, swagger_doc: "dfc-v1.7/swagger.yaml
 
           run_test!
         end
+
+        describe "with empty request body" do
+          let(:supplied_product) { nil }
+          run_test!
+        end
       end
 
       response "200", "success" do