remove 'None' flag from AirportMovementNode, Cargo and TrackExtra viewmodels

Author: LeftofZen

Definitions/ObjectModels/Objects/Airport/AirportMovementNodeFlags.cs

@@ -3,7 +3,7 @@ namespace Definitions.ObjectModels.Objects.Airport;
 [Flags]
 public enum AirportMovementNodeFlags : uint16_t
 {
-	None = 0,
+	//None = 0,
 	Terminal = 1 << 0,
 	TakeoffEnd = 1 << 1,
 	Flag2 = 1 << 2,

Gui/ViewModels/LocoTypes/Objects/CargoViewModel.cs

@@ -1,4 +1,5 @@
 using Definitions.ObjectModels.Objects.Cargo;
+using PropertyModels.ComponentModel.DataAnnotations;
 
 namespace Gui.ViewModels;
 
@@ -17,6 +18,7 @@ public CargoCategory CargoCategory
 		set => Model.CargoCategory = value;
 	}
 
+	[EnumProhibitValues<CargoObjectFlags>(CargoObjectFlags.None)]
 	public CargoObjectFlags Flags
 	{
 		get => Model.Flags;

Gui/ViewModels/LocoTypes/Objects/TrackExtraViewModel.cs

@@ -1,11 +1,13 @@
 using Definitions.ObjectModels.Objects.Track;
 using Definitions.ObjectModels.Objects.TrackExtra;
+using PropertyModels.ComponentModel.DataAnnotations;
 
 namespace Gui.ViewModels;
 
 public class TrackExtraViewModel(TrackExtraObject model)
 	: LocoObjectViewModel<TrackExtraObject>(model)
 {
+	[EnumProhibitValues<TrackTraitFlags>(TrackTraitFlags.None)]
 	public TrackTraitFlags TrackPieces
 	{
 		get => Model.TrackPieces;

Gui/ViewModels/Pos3ViewModel.cs

@@ -9,19 +9,19 @@ public class Pos3ViewModel : MiniReactiveObject
 
 	public coord_t X
 	{
-		get => Pos.X;
+		get => Pos?.X ?? 0;
 		set => Pos.X = value;
 	}
 
 	public coord_t Y
 	{
-		get => Pos.Y;
+		get => Pos?.Y ?? 0;
 		set => Pos.Y = value;
 	}
 
 	public coord_t Z
 	{
-		get => Pos.Z;
+		get => Pos?.Z ?? 0;
 		set => Pos.Z = value;
 	}
 }