Function check_valid_string_optional

pub fn check_valid_string_optional<T: AsRef<str>>(
    s: Option<T>,
    param: &str,
) -> Result<()>

Checks the string s if Some, contains only ASCII characters and has semantic meaning.

Errors

Returns an error if:

• s is an empty string.
• s consists solely of whitespace characters.
• s contains one or more non-ASCII characters.