Ruby

[ruby/irb] Avoid raising errors while running help for custom
commands
(https://github.com/ruby/irb/pull/944)

• Avoid raising errors while running help for custom commands

Raising an error from the help command is not a pleasure for the
end user, even if the command does not define any attributes

• Update test/irb/command/test_custom_command.rb

https://github.com/ruby/irb/commit/c8bba9f8dc

Co-authored-by: Stan Lo stan001212@gmail.com