Warehouse loading work.

src/engine/objects/Warehouse.java

@@ -29,7 +29,7 @@ import java.util.concurrent.ConcurrentHashMap;
 
 public class Warehouse {
 
-    public EnumSet<Enum.ResourceType> locked;
+    public EnumSet<Enum.ResourceType> locked = EnumSet.noneOf(Enum.ResourceType.class);
     public int buildingUID;
     public City city;
     public ArrayList<Transaction> transactions = new ArrayList<>();