Kind of a big oversight this. In wanting to get the leaderboard
refactors to move forward I sort of didn't realise the fact that all of
the error handling related to online status and such in
`BeatmapLeaderboard` kind of... can't stay there...
It's also an all-or-nothing business too - moving this stuff can't
really be done only in part.
Not sure whether tests are warranted if it's more or less moving logic
across?
Bartłomiej Dach
c29f59fcdb