1.2.1 - Multi-Doctor Surgery - Fix red error with Medical System Expansion 2

Fix red error with Medical System Expansion 2 :
Error while instantiating a mod of type MSE2.MedicalSystemExpansion: System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> HarmonyLib.HarmonyException: Patching exception in method static RimWorld.Bill_Medical RimWorld.HealthCardUtility::CreateSurgeryBill(Verse.Pawn medPawn, Verse.RecipeDef recipe, Verse.BodyPartRecord part, System.Collections.Generic.List`1<Verse.Thing> uniqueIngredients, System.Boolean sendMessages) ---> System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.ArgumentOutOfRangeException: Index was out of range. Must be non-negative and less than the size of the collection.