Fixed inability to create a wallet without an image

Wallet/CreateWalletHandler.cs

@@ -11,17 +11,17 @@ public class CreateWalletHandler(IWalletHostFactory componentFactory,
     public async Task<bool> Handle(CreateEventArgs<Wallet<(string, string, IImageDescriptor?)>> args,
         CancellationToken cancellationToken)
     {
-        if (args.Sender is Wallet <(string, string, IImageDescriptor?)> Wallet)
+        if (args.Sender is Wallet<(string, string, IImageDescriptor?)> wallet)
         {
-            if (Wallet.Value is (string name, string password,
+            (string name, string password, IImageDescriptor? imageDescriptor) = wallet.Value;
-                IImageDescriptor thumbnail) && 
+
-                name is { Length: > 0 } &&
+            if (name is { Length: > 0 } &&
                 password is { Length: > 0 })
             {
                 if (componentFactory.Create(name) is IComponentHost host)
                 {
                     IWalletFactory factory = host.Services.GetRequiredService<IWalletFactory>();
-                    if (await factory.Create(name, password, thumbnail))
+                    if (await factory.Create(name, password, imageDescriptor))
                     {
                         host.Start();
                         publisher.Publish(Activated.As(new Wallet<IComponentHost>(host)));

Wallet/IWalletFactory.cs

@@ -6,5 +6,5 @@ public interface IWalletFactory
 {
     Task<bool> Create(string name, 
         string password,
-        IImageDescriptor thumbnail);
+        IImageDescriptor? imageDescriptor);
 }

Wallet/SynchronizeMainViewModelHandler.cs

@@ -23,7 +23,7 @@ public class SynchronizeMainViewModelHandler(IPublisher publisher,
                         Wallet.Services.GetRequiredService<IDecoratorService<ProfileImage<IImageDescriptor>>>();
                     ProfileImage<IImageDescriptor>? profileImage = profileImageDecorator.Service;
 
-                    if (factory.Create<WalletNavigationViewModel>(args => args.Initialize(), configuration.Name, profileImage?.Value, selected) 
+                    if (factory.Create<WalletNavigationViewModel>(args => args.Initialize(), configuration.Name, profileImage?.Value ?? null, selected) 
                         is WalletNavigationViewModel viewModel)
                     {
                         publisher.Publish(Create.As<IMainNavigationViewModel>(viewModel),

Wallet/WalletFactory.cs

@@ -14,7 +14,7 @@ public class WalletFactory(ISecurityKeyFactory securityKeyFactory,
 {
     public async Task<bool> Create(string name,
         string password, 
-        IImageDescriptor thumbnail)
+        IImageDescriptor? imageDescriptor)
     {
         if (securityKeyFactory.Create(Encoding.UTF8.GetBytes(password)) is SecurityKey key)
         {
@@ -25,10 +25,14 @@ public class WalletFactory(ISecurityKeyFactory securityKeyFactory,
                 configuration.Write(args => args.Key = $"{Convert.ToBase64String(key.Salt)}:" +
                     $"{Convert.ToBase64String(key.EncryptedKey)}:{Convert.ToBase64String(key.DecryptedKey)}");
 
-                string file = Path.Combine(environment.ContentRootPath, "Thumbnail.png");
+                if (imageDescriptor is not null)
-                using FileStream stream = File.OpenWrite(file);
+                {
+                    string file = Path.Combine(environment.ContentRootPath, "Thumbnail.png");
+                    using FileStream stream = File.OpenWrite(file);
+
+                    imageWriter.Write(imageDescriptor, stream);
+                }
 
-                imageWriter.Write(thumbnail, stream);
                 return true;
             }
         }

Wallet/WalletNavigationViewModel.cs

@@ -28,7 +28,7 @@ public partial class WalletNavigationViewModel :
     private bool isActivated;
 
     [ObservableProperty]
-    private IImageDescriptor imageDescriptor;
+    private IImageDescriptor? imageDescriptor;
 
     public WalletNavigationViewModel(IServiceProvider provider,
         IServiceFactory factory,
@@ -38,8 +38,8 @@ public partial class WalletNavigationViewModel :
         IDisposer disposer,
         IContentTemplate template,
         string name,
-        IImageDescriptor imageDescriptor,
+        IImageDescriptor? imageDescriptor = default,
-        bool isSelected) : base(provider, factory, mediator, publisher, subscriber, disposer)
+        bool isSelected = false) : base(provider, factory, mediator, publisher, subscriber, disposer)
     {
         Template = template;
         Name = name;