Api 27055 null vet icn v2 526 (#12895)

* Add before_action for CCG

* Add nil-safing to mpi_record

* Add rspec test

* Remove byebug

modules/claims_api/app/models/claims_api/veteran.rb

@@ -69,7 +69,7 @@ def mpi
     end
 
     def mpi_record?(user_key: uuid)
-      mpi.mvi_response(user_key:).ok?
+      mpi&.mvi_response(user_key:)&.ok?
     end
 
     def ssn=(new_ssn)

modules/claims_api/spec/requests/v2/veterans/disability_compensation_request_spec.rb

@@ -3051,6 +3051,23 @@
           end
         end
       end
+
+      describe 'Service returns resource not found' do
+        context 'when no ICN value is supplied' do
+          let(:veteran_id) { nil }
+
+          it 'responds with bad request' do
+            with_okta_user(scopes) do |auth_header|
+              VCR.use_cassette('evss/claims/claims') do
+                json = JSON.parse(data)
+                data = json
+                post submit_path, params: data, headers: auth_header
+                expect(response).to have_http_status(:not_found)
+              end
+            end
+          end
+        end
+      end
     end
 
     context 'validate' do