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
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https://github.com/ruby/irb/commit/c8bba9f8dc
Co-authored-by: Stan Lo <stan001212@gmail.com>
a510175e8f