Libgdx with scene2d and actor does not display sprite

I am testing Libgdx and Scene2d. I was expecting this little program to display the logo, but it only draws a black screen. Any idea what I'm missing?

public class MyGame implements ApplicationListener {
    private Stage stage;

    @Override
    public void create() {
        stage = new Stage(800, 800, false);
        Gdx.input.setInputProcessor(stage);
        MyActor actor = new MyActor();
        stage.addActor(actor);
    }

    @Override
    public void render() {
        Gdx.gl.glClear(GL10.GL_COLOR_BUFFER_BIT);
        stage.act(Gdx.graphics.getDeltaTime());
        stage.draw();
    }

    @Override
    public void dispose() {
        stage.dispose();
    }

    @Override
    public void resize(int width, int height) {
            stage.setViewport(800, 800, false);
    }
}


public class MyActor extends Actor {
    Sprite sprite;

    public MyActor() {
        sprite = new Sprite();
        sprite.setTexture(new Texture("data/libgdx.png"));

        setWidth(sprite.getWidth());
        setHeight(sprite.getHeight());
        setBounds(0, 0, getWidth(), getHeight());
        setTouchable(Touchable.enabled);
        setX(0);
        setY(0);
    }

    @Override
    public void draw(SpriteBatch batch, float parentAlpha) {
        Color color = getColor();
        batch.setColor(color.r, color.g, color.b, color.a * parentAlpha);
        batch.draw(sprite, getX(), getY());
    }
}