def case_default_panels(case_obj):
    """Get a list of case default panels from a case dictionary

    Args:
        case_obj(dict): a case object

    Returns:
        case_panels(list): a list of panels (panel_name)
    """
    case_panels = [
        panel["panel_name"]
        for panel in case_obj.get("panels", [])
        if panel.get("is_default", None) is True
    ]
    return case_panels