Return empty string instead of null
Return empty string instead of null

kappa44/maptest,vrmap/geojson-share-maps,Carlowahlen/geojson-share-mapscw,kappa44/maptest,bmcbride/geojson-share-maps,Carlowahlen/geojson-share-mapscw,bmcbride/geojson-share-maps,vrmap/geojson-share-maps