Add a completely empty example group smoke test

Author: pirj

spec/smoke_tests/weird_rspec_spec.rb

@@ -201,6 +201,8 @@ def announce
 RSpec.describe do end
 RSpec.shared_examples('pointless2') do end
 RSpec.shared_context('even pointless-er2') do end
+RSpec.describe
+RSpec.describe 'empty'
 
 class Broken
 end