SAL AllowBills MissingMethodException & null ref issue in #568

[Sn1p3rr3c0n]

Uninstalling a SAL causes the following error:

System.MissingMethodException: Constructor on type 'RimWorld.Bill_ProductionWithUft' not found.
  at System.RuntimeType.CreateInstanceImpl (System.Reflection.BindingFlags bindingAttr, System.Reflection.Binder binder, System.Object[] args, System.Globalization.CultureInfo culture, System.Object[] activationAttributes, System.Threading.StackCrawlMark& stackMark) [0x00213] in <eae584ce26bc40229c1b1aa476bfa589>:0 
  at System.Activator.CreateInstance (System.Type type, System.Reflection.BindingFlags bindingAttr, System.Reflection.Binder binder, System.Object[] args, System.Globalization.CultureInfo culture, System.Object[] activationAttributes) [0x00095] in <eae584ce26bc40229c1b1aa476bfa589>:0 
  at System.Activator.CreateInstance (System.Type type, System.Object[] args) [0x00000] in <eae584ce26bc40229c1b1aa476bfa589>:0 
  at ProjectRimFactory.AutoMachineTool.PRF_SAL_Trarget+<>c.<AllowBills>b__19_1 (RimWorld.Bill b) [0x0003c] in <0884104c81a14098be40b0599f3ddb01>:0 
  at ProjectRimFactory.AutoMachineTool.Ops+<>c__DisplayClass4_0`2[TSource,TResult].<SelectMany>b__0 (TSource e) [0x00000] in <0884104c81a14098be40b0599f3ddb01>:0 
  at System.Linq.Enumerable+SelectManySingleSelectorIterator`2[TSource,TResult].MoveNext () [0x00051] in <351e49e2a5bf4fd6beabb458ce2255f3>:0 
  at System.Collections.Generic.List`1[T].InsertRange (System.Int32 index, System.Collections.Generic.IEnumerable`1[T] collection) [0x000db] in <eae584ce26bc40229c1b1aa476bfa589>:0 
  at System.Collections.Generic.List`1[T].AddRange (System.Collections.Generic.IEnumerable`1[T] collection) [0x00000] in <eae584ce26bc40229c1b1aa476bfa589>:0 
  at ProjectRimFactory.AutoMachineTool.PRF_SAL_Trarget.AllowBills () [0x00096] in <0884104c81a14098be40b0599f3ddb01>:0 
  at ProjectRimFactory.AutoMachineTool.PRF_SAL_Trarget.FreeTarget () [0x0000e] in <0884104c81a14098be40b0599f3ddb01>:0 
  at ProjectRimFactory.AutoMachineTool.Building_AutoMachineTool.DeSpawn (Verse.DestroyMode mode) [0x00001] in <0884104c81a14098be40b0599f3ddb01>:0 
  at RimWorld.MinifyUtility.MakeMinified (Verse.Thing thing) [0x0002c] in <360933dd75ad47e8a6d2a631ae77b5d8>:0 
  at RimWorld.MinifyUtility.Uninstall (Verse.Thing th) [0x00021] in <360933dd75ad47e8a6d2a631ae77b5d8>:0 
  at RimWorld.Designator_Uninstall.DesignateThing (Verse.Thing t) [0x00040] in <360933dd75ad47e8a6d2a631ae77b5d8>:0 
  at RimWorld.InspectGizmoGrid+<>c__DisplayClass2_1.<DrawInspectGizmoGridFor>b__0 () [0x00018] in <360933dd75ad47e8a6d2a631ae77b5d8>:0 
  at Verse.Command_Action.ProcessInput (UnityEngine.Event ev) [0x00007] in <360933dd75ad47e8a6d2a631ae77b5d8>:0 
  at Verse.GizmoGridDrawer.DrawGizmoGrid (System.Collections.Generic.IEnumerable`1[T] gizmos, System.Single startX, Verse.Gizmo& mouseoverGizmo, System.Func`2[T,TResult] customActivatorFunc, System.Func`2[T,TResult] highlightFunc, System.Func`2[T,TResult] lowlightFunc) [0x006a6] in <360933dd75ad47e8a6d2a631ae77b5d8>:0 
  at RimWorld.InspectGizmoGrid.DrawInspectGizmoGridFor (System.Collections.Generic.IEnumerable`1[T] selectedObjects, Verse.Gizmo& mouseoverGizmo) [0x00244] in <360933dd75ad47e8a6d2a631ae77b5d8>:0  
(Filename: C:\buildslave\unity\build\Runtime/Export/Debug/Debug.bindings.h Line: 39)

This seems to caused by changes to RimWorld.Bill_ProductionWithUft.

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#568 introduced a null ref issue by missing some brackets