related to issue #41, FeatureSet now handle empty features better.
related to issue #41, FeatureSet now handle empty features better.

BrunoCaimar/ArcREST,pLeBlanc93/ArcREST,achapkowski/ArcREST,jgravois/ArcREST,adegwerth/ArcREST,DShokes/ArcREST,Esri/ArcREST