fn system_info_as_list(sysinfo: Option<String>) -> Vec<String> {
    match sysinfo {
        Some(value) => value.split_ascii_whitespace().map(String::from).collect(),
        // For list fields absence of a field is equivalent to an empty list.
        None => Vec::new(),
    }
}
Returns a system info value as a list of strings.
Absence of a value is treated as an empty list.
src/unix/linux/system.rs