feat: refresh existing snapshots from XML after sync

src/BusProNet/XmlLoader/PickupLoader.php

@@ -137,6 +137,9 @@ class PickupLoader extends AbstractLoader
     {
         foreach ($pickups as $pickup) {
             $pickupData = $this->loadById($pickup->id);
+            if (null === $pickupData) {
+                continue;
+            }
 
             $pickup->code = $pickupData->code;
             $pickup->postalCode = $pickupData->postalCode;