private @Nullable GoogleArtist[] getArtists(List<MusicGroup> artists) {
    if (artists == null || artists.isEmpty()) {
      return null;
    }
    GoogleArtist[] googleArtists = new GoogleArtist[artists.size()];
    for (int i = 0; i < artists.size(); i++) {
      GoogleArtist googleArtist = new GoogleArtist();
      googleArtist.setTitle(artists.get(i).getName());
      googleArtists[i] = googleArtist;
    }
    return googleArtists;
  }
Summarizes result as a human-readable string. Empty string indicates no issues.
extensions/data-transfer/portability-data-transfer-google/src/main/java/org/datatransferproject/datatransfer/google/music/GoogleMusicImporter.java