AP-5701: Update proceeding_types controller

If no proceedings are found, redirect to the has_other_proceedings page

This should avoid a user pushing the back button and arriving at a page that
cannot be displayed because there are no proceedings to choose from

app/controllers/providers/proceedings_types_controller.rb

@@ -4,6 +4,8 @@ class ProceedingsTypesController < ProviderBaseController
     def index
       proceeding_types
       excluded_codes
+    rescue LegalFramework::ProceedingTypes::All::NoMatchingProceedingsFoundError
+      redirect_to providers_legal_aid_application_has_other_proceedings_path(legal_aid_application)
     end
 
     # POST /provider/applications/:legal_aid_application_id/proceedings_types

spec/requests/providers/proceedings_types_controller_spec.rb

@@ -34,6 +34,17 @@
         expect(response.body).not_to include("govuk-form-group--error")
       end
 
+      context "when there are no available proceedings to show" do
+        before do
+          allow(LegalFramework::ProceedingTypes::All).to receive(:call).and_raise(LegalFramework::ProceedingTypes::All::NoMatchingProceedingsFoundError)
+        end
+
+        it "redirects to the has_other_proceedings page" do
+          get_request
+          expect(response).to redirect_to providers_legal_aid_application_has_other_proceedings_path(legal_aid_application)
+        end
+      end
+
       describe "back link" do
         context "when the applicant's address used address lookup service", :vcr do
           let(:legal_aid_application) { create(:legal_aid_application, :with_applicant_and_address_lookup) }