Don’t return JSON for empty selection list

src/main/java/org/genesys2/server/servlet/controller/SelectionController.java

@@ -107,14 +107,16 @@ public class SelectionController extends BaseController {
 	@ResponseBody
 	public List<AccessionGeoJson> selectionGeo() {
 		List<AccessionGeoJson> geo = new ArrayList<AccessionGeoJson>();
-		for (AccessionGeo acnGeo : genesysService.listAccessionsGeo(selectionBean.copy())) {
-			AccessionGeoJson g = new AccessionGeoJson();
-			g.id = acnGeo.getAccession().getId();
-			g.lat = acnGeo.getLatitude();
-			g.lng = acnGeo.getLongitude();
-			g.accessionName = acnGeo.getAccession().getAccessionName();
-			g.instCode = acnGeo.getAccession().getInstituteCode();
-			geo.add(g);
+		if (selectionBean.size() > 0) {
+			for (AccessionGeo acnGeo : genesysService.listAccessionsGeo(selectionBean.copy())) {
+				AccessionGeoJson g = new AccessionGeoJson();
+				g.id = acnGeo.getAccession().getId();
+				g.lat = acnGeo.getLatitude();
+				g.lng = acnGeo.getLongitude();
+				g.accessionName = acnGeo.getAccession().getAccessionName();
+				g.instCode = acnGeo.getAccession().getInstituteCode();
+				geo.add(g);
+			}
 		}
 		return geo;
 	}