Remove unnecessary test for null
Remove unnecessary test for null

thhomas/ol3-cesium,thhomas/ol3-cesium,thhomas/ol3-cesium,openlayers/ol3-cesium,oterral/ol3-cesium,oterral/ol3-cesium,openlayers/ol-cesium,openlayers/ol3-cesium,gberaudo/ol3-cesium,gberaudo/ol3-cesium,openlayers/ol-cesium