Track objects don't always have all their properties

[mjiggidy]

According to the documentation for avb.trackgroups.Track, a Track object should have an attributes property.

I've found that not every Track object does, unless the track has some special attributes set via Avid (such as a a custom track name). For tracks that are "just regular ol' Tracks," often if I try to access my_track.attributes, I get an exception: "Track has no attribute attributes" where I would instead expect maybe an "empty" avb.attributes.Attributes object instead.