Merge pull request #13 from ravkr/master

Fix error when feature_clicked is null

 map.js

@@ -170,7 +170,7 @@
            if(vehicle.isDeleted) {
                if(vehicle_feature) {
                    vehicles_source.removeFeature(vehicle_feature);
                    if(feature_clicked.getId() == vehicle_feature.getId()) {
                    if(feature_clicked && feature_clicked.getId() === vehicle_feature.getId()) {
                        featureClicked();
                    }
                }