Function id3::no_tag_ok

pub fn no_tag_ok(rs: Result<Tag>) -> Result<Option<Tag>>

Takes a tag result and maps the NoTag kind to None. Any other error is returned as Err.

Example

use id3::{Tag, Error, ErrorKind, no_tag_ok};

let rs = Err(Error{
    kind: ErrorKind::NoTag,
    description: "the file contains no ID3 tag".to_string(),
    partial_tag: None,
});
assert!(matches!(no_tag_ok(rs), Ok(None)));

let rs = Err(Error{
    kind: ErrorKind::Parsing,
    description: "frame 12 could not be decoded".to_string(),
    partial_tag: Some(Tag::new()),
});
assert!(no_tag_ok(rs).is_err());