Add Drawable.Empty static helper for empty construction (#3143)
Add Drawable.Empty static helper for empty construction (#3143)

Add Drawable.Empty static helper for empty construction
ppy/osu-framework,peppy/osu-framework,ppy/osu-framework,smoogipooo/osu-framework,peppy/osu-framework,EVAST9919/osu-framework,ZLima12/osu-framework,smoogipooo/osu-framework,EVAST9919/osu-framework,ppy/osu-framework,peppy/osu-framework,EVAST9919/osu-framework,ZLima12/osu-framework,EVAST9919/osu-framework