Rules are checked when they are made, but a saved smart album can go
bad later. The usual case is a rule testing an album that is then
deleted; it silently matches nothing.
Catalog::smart_album_problems(id) checks a saved album's rules as they
are now (RuleSet::upgrade, then RuleSet::check). It is empty for a sound
smart album, a plain album or no album. albums.list reports `problems`
for every smart album, e.g. ["rule 1: no album 8"].
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Nathaniel LedfordandClaude Opus 5.5
bb50127de4