fix: Fix an issue casting a null Variant.

Author: fuzzybinary

src/dart/godot_dart/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 0.6.1
+
+- Fix `Variant.cast` to correctly return null in cases where the Variant is null.
+
 ## 0.6.0
 
 - Adjust generate global constats to avoid unnecessary prefixes.

src/dart/godot_dart/lib/src/variant/variant.dart

@@ -197,8 +197,8 @@ class Variant implements Finalizable {
       var typeInfo = gde.dartBindings.getGodotTypeInfo(T);
       return convertFromVariant(this, typeInfo) as T?;
     }
-    final obj = convertFromVariant(this, GodotObject.sTypeInfo) as GodotObject;
-    return obj.cast<T>();
+    final obj = convertFromVariant(this, GodotObject.sTypeInfo) as GodotObject?;
+    return obj?.cast<T>();
   }
 
   void _attachFinalizer() {

src/dart/godot_dart/pubspec.yaml

@@ -1,7 +1,7 @@
 name: godot_dart
 description: Dart bindings for the Godot game engine
 repository: https://github.com/fuzzybinary/godot_dart
-version: 0.6.0
+version: 0.6.1
 
 environment:
   sdk: '>=3.2.0 <4.0.0'