crash when trying to adjust storage

This seems to happen when I select a stockpile zone and copy it, then select a a small shelf and try to shift click multiple shelves

```

Noble Fates Critical Error:

NullReferenceException: Object reference not set to an instance of an object

StorageSettings.CanAddToSelection (StorageSettings selected) (at <6edf42595dbd4bffa55cb2d7838c8a81>:0)

PropActor.CanAddToSelection (Actor selected) (at <6edf42595dbd4bffa55cb2d7838c8a81>:0)

SelectionManager.Select (ActorBehavior newSelection, System.Boolean addToSelection, System.Boolean refreshDetails, System.Boolean clearPrevSel) (at <6edf42595dbd4bffa55cb2d7838c8a81>:0)

SelectionManager.SelectAllVisible (System.Type type) (at <6edf42595dbd4bffa55cb2d7838c8a81>:0)

SelectionManager.Tick (System.Single dt) (at <6edf42595dbd4bffa55cb2d7838c8a81>:0)

ManagerBehavior.Update () (at <6edf42595dbd4bffa55cb2d7838c8a81>:0)

```