Warehouse record removed in destruction banes.

src/engine/workthreads/DestroyCityThread.java

@@ -125,6 +125,13 @@ public class DestroyCityThread implements Runnable {
 
             cityBuilding.setProtectionState(mbEnums.ProtectionState.NONE);
 
+            // Remove warehouse entry if one exists.
+
+            if (cityBuilding.getBlueprint().getBuildingGroup() == mbEnums.BuildingGroup.WAREHOUSE) {
+                DbManager.WarehouseQueries.DELETE_WAREHOUSE(city.warehouse);
+                city.warehouse = null;
+            }
+
             // Destroy all remaining city assets
 
             if ((cityBuilding.getBlueprint().getBuildingGroup() == mbEnums.BuildingGroup.BARRACK)