Game crashes when raining

Bug occurs when raining. Changing rainDropDecay to zero for all materials did not help.

```

Noble Fates Critical Error:

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

Report: d24cf216-dd28-4f04-87cf-4f49f051bac4

InstancedItem.StatsUpdated () (at <217c0b863f8c4291a89755eb24277ef7>:0)

InstancedItem.Damage (System.Single damage, System.Boolean decay, System.Boolean drops, System.Boolean qualityScaled) (at <217c0b863f8c4291a89755eb24277ef7>:0)

Item.RainHit () (at <217c0b863f8c4291a89755eb24277ef7>:0)

Character.RainHit () (at <217c0b863f8c4291a89755eb24277ef7>:0)

PrecipitationWeatherEvent+<>c.b__17_1 (Character character) (at <217c0b863f8c4291a89755eb24277ef7>:0)

CharacterManager.VisitCharactersAt (TilePos tile, CharacterVisitor visitor) (at <217c0b863f8c4291a89755eb24277ef7>:0)

PrecipitationWeatherEvent.DropLanded (UnityEngine.Vector3 pos, Actor actor) (at <217c0b863f8c4291a89755eb24277ef7>:0)

RainWeatherEvent.DropLanded (UnityEngine.Vector3 pos, Actor actor) (at <217c0b863f8c4291a89755eb24277ef7>:0)

PrecipitationWeatherEvent.Tick (System.Single dt) (at <217c0b863f8c4291a89755eb24277ef7>:0)

WeatherManager.Tick (System.Single dt) (at <217c0b863f8c4291a89755eb24277ef7>:0)

ManagerBehavior.Update () (at <217c0b863f8c4291a89755eb24277ef7>:0)

```