Filter out empty values and do not downcase nils

app/controllers/form_controller.rb

@@ -11,7 +11,7 @@ class FormController < ApplicationController
       mandatory_questions_with_no_response = mandatory_questions_with_no_response(responses_for_page)
 
       if mandatory_questions_with_no_response.empty? && @log.update(responses_for_page.merge(updated_by: current_user))
-        flash[:notice] = "You have successfully updated #{@page.questions.map(&:check_answer_label).first.downcase}" if previous_interruption_screen_page_id.present?
+        flash[:notice] = "You have successfully updated #{@page.questions.map(&:check_answer_label).reject { |e| e.to_s.empty? }.first&.downcase}" if previous_interruption_screen_page_id.present?
         redirect_to(successful_redirect_path)
       else
         mandatory_questions_with_no_response.map do |question|

spec/fixtures/forms/2021_2022.json

@@ -57,7 +57,6 @@
               "questions": {
                 "sex1": {
                   "check_answers_card_number": 1,
-                  "check_answer_label": "Lead tenant’s gender identity",
                   "header": "Which of these best describes the tenant’s gender identity?",
                   "type": "radio",
                   "answer_options": {

spec/requests/form_controller_spec.rb

@@ -546,7 +546,7 @@ RSpec.describe FormController, type: :request do
           end
 
           before do
-            post "/lettings-logs/#{lettings_log.id}/#{page_id.dasherize}?referrer=interruption_screen", params:
+            post "/lettings-logs/#{lettings_log.id}/lead-tenant-age?referrer=interruption_screen", params:
           end
 
           it "redirects back to the soft validation page" do
@@ -560,6 +560,29 @@ RSpec.describe FormController, type: :request do
           end
         end
 
+        context "when the question was accessed from an interruption screen and it has no check answers" do
+          let(:params) do
+            {
+              id: lettings_log.id,
+              lettings_log: {
+                page: "person_1_gender",
+                sex1: "F",
+                interruption_page_id: "retirement_value_check",
+              },
+            }
+          end
+
+          before do
+            post "/lettings-logs/#{lettings_log.id}/lead-tenant-gender-identity?referrer=interruption_screen", params:
+          end
+
+          it "displays a success banner without crashing" do
+            follow_redirect!
+            follow_redirect!
+            expect(response.body).to include("You have successfully updated")
+          end
+        end
+
         context "when requesting a soft validation page for validation that isn't triggering" do
           before do
             get "/lettings-logs/#{lettings_log.id}/retirement-value-check", headers: headers.merge({ "HTTP_REFERER" => referrer })