Verify longitude and latitude are present before adding feature

 map.html

@@ -18,6 +18,6 @@
<script src="https://cdn.jsdelivr.net/gh/openlayers/openlayers.github.io@master/en/v5.3.0/build/ol.js" integrity="sha384-iQkGyyH4ioz3m+maM3s9MX1Oq67mACa4B9Z3ovUv3Sv37LJ96fx3WnZfLoiC3Wfl" crossorigin="anonymous"></script>
<script tyle="text/javascript" src="lang_pl.js?v2" id="lang_script"></script>
<script tyle="text/javascript" src="common.js?v2"></script>
<script tyle="text/javascript" src="map.js?v4"></script>
<script tyle="text/javascript" src="map.js?v5"></script>
</body>
</html>

 map.js

@@ -242,7 +242,7 @@
            var vehicle = data.vehicles[i];
            
            var vehicle_feature = buses_source.getFeatureById('b' + vehicle.id);
            if(vehicle.isDeleted) {
            if(vehicle.isDeleted || !vehicle.latitude || !vehicle.longitude) {
                if(vehicle_feature) {
                    buses_source.removeFeature(vehicle_feature);
                    if(feature_clicked && feature_clicked.getId() === vehicle_feature.getId()) {