`Cucumber::CucumberExpressions::Group` can have `nil` children since cucumber-expressions v19

[Rdx31]

👓 What did you see?

The v10.2.0 release permits cumber-expressions up to v19.

The cucumber-expressions v19 release includes an important change in this PR:

children of Cucumber::CucumberExpressions::Group can now be nil

which breaks

cucumber-ruby/lib/cucumber/formatter/message_builder.rb

Line 146 in 78e472d

children: group.children.map { |child| argument_group_to_message(child) }

leading to the following error

undefined method 'map' for nil (NoMethodError)
gems/cucumber-10.2.0/lib/cucumber/formatter/message_builder.rb:149:in 'Cucumber::Formatter::MessageBuilder#argument_group_to_message'
gems/cucumber-10.2.0/lib/cucumber/formatter/message_builder.rb:137:in 'block in Cucumber::Formatter::MessageBuilder#step_match_arguments'
gems/cucumber-10.2.0/lib/cucumber/formatter/message_builder.rb:132:in 'Array#map'
gems/cucumber-10.2.0/lib/cucumber/formatter/message_builder.rb:132:in 'Cucumber::Formatter::MessageBuilder#step_match_arguments'

✅ What did you expect to see?

I would have expected no error :)

📦 Which tool/library version are you using?

No response

🔬 How could we reproduce it?

No response

📚 Any additional context?

No response

[vizv]

I have already opened a PR #1819 to fix this

[luke-hill]

For now using a version of expressions in the v18 series will not cause this error

There is a PR as mentioned. However the next version intended to go out for cucumber-ruby is v11 which will be a step towards more CCK conformance as well as beginning to port over some of the formatters