set can not be null in BeatmapSetCover.cs
set can not be null in BeatmapSetCover.cs

DrabWeb/osu,johnneijzen/osu,naoey/osu,smoogipoo/osu,johnneijzen/osu,naoey/osu,2yangk23/osu,peppy/osu,2yangk23/osu,peppy/osu,ZLima12/osu,ppy/osu,UselessToucan/osu,ppy/osu,NeoAdonis/osu,DrabWeb/osu,UselessToucan/osu,DrabWeb/osu,EVAST9919/osu,smoogipooo/osu,ppy/osu,NeoAdonis/osu,ZLima12/osu,peppy/osu,EVAST9919/osu,naoey/osu,UselessToucan/osu,Drezi126/osu,peppy/osu-new,smoogipoo/osu,Nabile-Rahmani/osu,NeoAdonis/osu,smoogipoo/osu,Frontear/osuKyzer