remove empty helper tests

test/unit/helpers/call_for_participation_helper_test.rb

-require 'test_helper'
-
-class CallForParticipationHelperTest < ActionView::TestCase
-end

test/unit/helpers/cfp/availabilities_helper_test.rb

-require 'test_helper'
-
-class Cfp::AvailabilitiesHelperTest < ActionView::TestCase
-end

test/unit/helpers/cfp/confirmations_helper_test.rb

-require 'test_helper'
-
-class Cfp::ConfirmationsHelperTest < ActionView::TestCase
-end

test/unit/helpers/cfp/events_helper_test.rb

-require 'test_helper'
-
-class Cfp::EventsHelperTest < ActionView::TestCase
-end

test/unit/helpers/cfp/passwords_helper_test.rb

-require 'test_helper'
-
-class Cfp::PasswordsHelperTest < ActionView::TestCase
-end

test/unit/helpers/cfp/people_helper_test.rb

-require 'test_helper'
-
-class Cfp::PeopleHelperTest < ActionView::TestCase
-end

test/unit/helpers/cfp/sessions_helper_test.rb

-require 'test_helper'
-
-class Cfp::SessionsHelperTest < ActionView::TestCase
-end

test/unit/helpers/cfp/users_helper_test.rb

-require 'test_helper'
-
-class Cfp::UsersHelperTest < ActionView::TestCase
-end

test/unit/helpers/cfp/welcome_helper_test.rb

-require 'test_helper'
-
-class Cfp::WelcomeHelperTest < ActionView::TestCase
-end

test/unit/helpers/conferences_helper_test.rb

-require 'test_helper'
-
-class ConferencesHelperTest < ActionView::TestCase
-end

test/unit/helpers/event_feedbacks_helper_test.rb

-require 'test_helper'
-
-class EventFeedbacksHelperTest < ActionView::TestCase
-end

test/unit/helpers/event_ratings_helper_test.rb

-require 'test_helper'
-
-class EventRatingsHelperTest < ActionView::TestCase
-end

test/unit/helpers/events_helper_test.rb

-require 'test_helper'
-
-class EventsHelperTest < ActionView::TestCase
-end

test/unit/helpers/home_helper_test.rb

-require 'test_helper'
-
-class HomeHelperTest < ActionView::TestCase
-end

test/unit/helpers/people_helper_test.rb

-require 'test_helper'
-
-class PeopleHelperTest < ActionView::TestCase
-end

test/unit/helpers/public/feedback_helper_test.rb

-require 'test_helper'
-
-class Public::FeedbackHelperTest < ActionView::TestCase
-end

test/unit/helpers/public/schedule_helper_test.rb

-require 'test_helper'
-
-class Public::ScheduleHelperTest < ActionView::TestCase
-end

test/unit/helpers/recent_changes_helper_test.rb

-require 'test_helper'
-
-class RecentChangesHelperTest < ActionView::TestCase
-end

test/unit/helpers/schedule_helper_test.rb

-require 'test_helper'
-
-class ScheduleHelperTest < ActionView::TestCase
-end

test/unit/helpers/statistics_helper_test.rb

-require 'test_helper'
-
-class StatisticsHelperTest < ActionView::TestCase
-end

test/unit/helpers/tickets_helper_test.rb

-require 'test_helper'
-
-class TicketsHelperTest < ActionView::TestCase
-end

test/unit/helpers/users_helper_test.rb

-require 'test_helper'
-
-class UsersHelperTest < ActionView::TestCase
-end