Fix potential nullref in FilterControl during asynchronous load
Fix potential nullref in FilterControl during asynchronous load

UselessToucan/osu,ppy/osu,NeoAdonis/osu,smoogipoo/osu,ppy/osu,UselessToucan/osu,peppy/osu,peppy/osu,smoogipoo/osu,NeoAdonis/osu,NeoAdonis/osu,smoogipooo/osu,peppy/osu,peppy/osu-new,smoogipoo/osu,UselessToucan/osu,ppy/osu