check for the existence of spatialReference in metadata (#810)
check for the existence of spatialReference in metadata (#810)

in case the service itself is flaky
RuXxar/esri-leaflet,RuXxar/esri-leaflet,RuXxar/esri-leaflet,Esri/esri-leaflet,Esri/esri-leaflet,Esri/esri-leaflet