- fix: UpdateResolver preview think

Nebula.Launcher/Converters/TypeConverters.cs

@@ -24,5 +24,5 @@ public static class TypeConverters
         });
 
     public static FuncValueConverter<string, Avalonia.Media.Color> NameColorRepresentation { get; } =
-        new(ColorUtils.GetColorFromString);
+        new((str)=>ColorUtils.GetColorFromString(str ?? throw new ArgumentNullException(nameof(str),"Name of color is null!")));
 }

Nebula.Launcher/LauncherConVar.cs

@@ -54,6 +54,4 @@ public static class LauncherConVar
     public static readonly ConVar<string> CurrentLang = ConVarBuilder.Build<string>("launcher.language", CultureInfo.CurrentCulture.Name);
     public static readonly ConVar<string> ILSpyUrl = ConVarBuilder.Build<string>("decompiler.url",
     "https://github.com/icsharpcode/ILSpy/releases/download/v9.0/ILSpy_binaries_9.0.0.7889-x64.zip");
-    
-    
 }

Nebula.Launcher/Services/LocalisationService.cs

@@ -72,10 +72,6 @@ public class LocaledText : MarkupExtension
 
     public LocaledText(string key) => Key = key;
 
-    public LocaledText()
-    {
-    }
-
     public override object ProvideValue(IServiceProvider serviceProvider)
     {
         return LocalisationService.GetString(Key, Options);

Nebula.Launcher/ViewModels/Pages/ContentBrowserViewModel.cs

@@ -416,7 +416,20 @@ public abstract class BaseFolderContentEntry : ViewModelBase, IContentEntry
     private Dictionary<string, IContentEntry> _childs = [];
 
     public string IconPath => "/Assets/svg/folder.svg";
-    public IContentHolder Holder { get; private set; }
+    
+    private IContentHolder? _holder = null;
+    public IContentHolder Holder
+    {
+        get
+        {
+            if(_holder == null) 
+                throw new InvalidOperationException(
+                    GetType().Name + " was not initialised! Call Init(IContentHolder holder, string? name = null) before using it.");
+            
+            return _holder;
+        }
+    }
+
     public IContentEntry? Parent { get; set; }
     public string? Name { get; private set; }
     
@@ -432,7 +445,7 @@ public abstract class BaseFolderContentEntry : ViewModelBase, IContentEntry
     public void Init(IContentHolder holder, string? name = null)
     {
         Name = name;
-        Holder = holder;
+        _holder = holder;
     }
 
     public T AddChild<T>(T child) where T: IContentEntry