Fix editor crashing when loading a beatmap for an unsupported ruleset
Fix editor crashing when loading a beatmap for an unsupported ruleset

johnneijzen/osu,peppy/osu,peppy/osu,UselessToucan/osu,smoogipoo/osu,peppy/osu-new,peppy/osu,smoogipoo/osu,UselessToucan/osu,smoogipooo/osu,NeoAdonis/osu,NeoAdonis/osu,UselessToucan/osu,EVAST9919/osu,johnneijzen/osu,NeoAdonis/osu,smoogipoo/osu,ppy/osu,ppy/osu,ppy/osu,EVAST9919/osu,2yangk23/osu,2yangk23/osu