Store collection name as meta var in CollectionItem, improve exception
Store collection name as meta var in CollectionItem, improve exception

tightenco/jigsaw,adamwathan/jigsaw,quickliketurtle/jigsaw,tightenco/jigsaw,adamwathan/jigsaw,quickliketurtle/jigsaw,quickliketurtle/jigsaw,tightenco/jigsaw