Registration tickets to be set for registration period

Admin must create at least one registration ticket before creating registration period.

spec/features/organization_admin_ability_spec.rb

@@ -5,6 +5,7 @@ feature 'Has correct abilities' do
   let(:conference) { create(:full_conference, organization: organization) }
   let(:role_organization_admin) { Role.find_by(name: 'organization_admin', resource: organization) }
   let(:user_organization_admin) { create(:user, role_ids: [role_organization_admin.id]) }
+  let!(:registration_ticket) { create(:registration_ticket, conference: conference) }
 
   context 'when user is organization_admin' do
     before do

spec/features/organizer_ability_spec.rb

@@ -8,6 +8,7 @@ feature 'Has correct abilities' do
   let(:role_organizer_conf) { Role.find_by(name: 'organizer', resource: conference) }
   let(:role_organizer_other_conf) { Role.find_by(name: 'organizer', resource: other_conference) }
   let(:user_organizer) { create(:user, role_ids: [role_organizer_conf.id, role_organizer_other_conf.id]) }
+  let!(:registration_ticket) { create(:registration_ticket, conference: conference) }
 
   context 'when user is organizer' do
     before do

spec/features/registration_periods_spec.rb

@@ -6,6 +6,7 @@ feature RegistrationPeriod do
   let!(:conference) { create(:conference) }
   let!(:organizer_role) { Role.find_by(name: 'organizer', resource: conference) }
   let!(:organizer) { create(:user, email: 'admin@example.com', role_ids: [organizer_role.id]) }
+  let!(:registration_ticket) { create(:registration_ticket, conference: conference) }
 
   shared_examples 'successfully' do
     scenario 'create and update registration period', js: true do