Merge branch 'rubocop/enable-cops-for-empty-lines' into 'master'

.rubocop.yml

app/controllers/admin/hooks_controller.rb

app/controllers/confirmations_controller.rb

app/controllers/import/base_controller.rb

app/controllers/import/fogbugz_controller.rb

app/controllers/import/gitorious_controller.rb

app/controllers/import/google_code_controller.rb

app/controllers/invites_controller.rb

app/controllers/projects/issues_controller.rb

app/controllers/projects/network_controller.rb

app/controllers/projects/wikis_controller.rb

app/helpers/emails_helper.rb

app/helpers/issuables_helper.rb

app/helpers/search_helper.rb

app/models/concerns/issuable.rb

app/models/members/project_member.rb

app/models/project_services/bugzilla_service.rb

app/models/project_services/custom_issue_tracker_service.rb

app/models/project_services/drone_ci_service.rb

app/models/project_services/issue_tracker_service.rb