Remove dead code from usersregistration (signup calls are always ajax) and remove application.html.erb (spree frontend default layout) because this usersregistration was the last bit of OFN code to use it

app/controllers/user_registrations_controller.rb

@@ -39,9 +39,6 @@ class UserRegistrationsController < Spree::UserRegistrationsController
   def render_error(errors = {})
     clean_up_passwords(resource)
     respond_to do |format|
-      format.html do
-        render :new
-      end
       format.js do
         render json: errors, status: :unauthorized
       end

app/views/layouts/application.html.erb

@@ -1 +0,0 @@
-<%= render :file => 'spree/layouts/spree_application' %>

spec/controllers/user_registrations_controller_spec.rb

@@ -60,14 +60,6 @@ describe UserRegistrationsController, type: :controller do
     end
   end
 
-  context "when registration fails" do
-    it "renders new" do
-      spree_post :create, spree_user: {}
-      expect(response.status).to eq(200)
-      expect(response).to render_template "spree/user_registrations/new"
-    end
-  end
-
   context "when registration succeeds" do
     context "when referer is not '/checkout'" do
       it "redirects to root" do