Error when set default_value to [] about launch_ros

[jacobperron]

I'm not having any issue setting a default value of [] (which evaluates to the empty string). Here's my test:

import launch


def generate_launch_description():
    return launch.LaunchDescription([
        launch.actions.DeclareLaunchArgument(name='foo_arg', default_value=[]),
        launch.actions.ExecuteProcess(
            cmd=['echo', launch.substitutions.LaunchConfiguration('foo_arg')],
            output='screen'
        )   
    ]) 

Can you please provide a complete launch script that reproduces the issue?

[jacobperron]

@mganglb Friendly ping. If you are still experiencing this error, please comment with more information and we can re-open this issue.