Paperclip duplicator will lose track of storage crate, withdrawn paperclips

[Trisscar05]

Paperclip duplicator will lose track of storage crate, and lose withdrawn paperclips past max stack size, if a pile of clips is on top of the building. Has only occurred on save load so far, not sure if that's just luck or is actually relevant.

-Error from console:

Exception filling tab ProjectRimFactory.Industry.UI.ITab_PaperclipDuplicator: System.NullReferenceException: Object reference not set to an instance of an object
at Verse.GridsUtility.GetThingList (IntVec3 c, Verse.Map map) [0x00000] in :0
at ProjectRimFactory.Storage.Building_MassStorageUnit.RegisterNewItem (Verse.Thing newItem) [0x00000] in :0
at ProjectRimFactory.Storage.Building_MassStorageUnit.Notify_ReceivedThing (Verse.Thing newItem) [0x00000] in :0
at ProjectRimFactory.Industry.UI.ITab_PaperclipDuplicator.HandleDepositWithdrawRequest () [0x00000] in :0
at ProjectRimFactory.Industry.UI.ITab_PaperclipDuplicator.FillTab () [0x00000] in :0
at Verse.InspectTabBase+c__AnonStorey0.<>m__0 () [0x00000] in :0
Verse.Log:Error(String, Boolean)
Verse.Log:ErrorOnce(String, Int32, Boolean)
Verse.c__AnonStorey0:<>m__0()
Verse.ImmediateWindow:DoWindowContents(Rect)
Verse.c__AnonStorey0:<>m__0(Int32)
UnityEngine.GUI:CallWindowDelegate(WindowFunction, Int32, Int32, GUISkin, Int32, Single, Single, GUIStyle)