I want to have a custom menu item that creates a prefab for me. I tried doing this:

public class ImportAnimations : ScriptableWizard {

    public Texture2D spritesheet;
    public TextAsset spritedoc;

    [MenuItem("Custom/Animations/ImportAnimations...")]
    static void CreateWizard()
    {
        ScriptableWizard.DisplayWizard("Import Animations from:", typeof(ImportAnimations), "Import");  
    }

    void OnWizardCreate()
    {
        GameObject go = new GameObject("TestAsset");
        go.AddComponent(typeof(Animation));
        go.SetActiveRecursively(false);
        AssetDatabase.CreateAsset(go, "Assets/Prefabs/TestAsset.prefab");
        GameObject.DestroyImmediate(go);
    }
}

This creates the prefab, but it also keeps the GameObject in the scene. If I delete the GameObject the prefab will be empty (the Animation component is lost). If I delete the prefab from my project folder before deleting the GameObject in my scene Unity crashes. (reported bug) Is there another way to do this? Or is it just a bug? (using b7)