List of score-part always One

[synchronisator]

The parser for score-parts is always 1 because the filter is not working like it should.

lib/src/music_xml_document.dart:36

score
        .findAllElements('part-list')
        .where((element) => element.getElement('score-part') != null)
        .map((element) => element.getElement('score-part')!)
        .map((element) => ScorePart.parse(element))
        .forEach((element) => scoreParts[element.id] = element);

The tag 'part-list' only appears one-time in the xml and contains a list of score-part. I changed the Code to this: and it worked:

score
        .findAllElements('part-list').first
        .findAllElements('score-part')
        .map(ScorePart.parse)
        .forEach((ScorePart element) => scoreParts[element.id] = element);

Because the part-list is marked as "required" in the decumentation the call of "first" should be save. But it could lead to an exception with a bad xml file.

[thaihuynhxyz]

fixed at #9