Custom visual and landing page not showing

Hi,

I just developed my first custom visual (in React) according to the tutorial: https://learn.microsoft.com/en-us/power-bi/developer/visuals/create-react-visual 

But when no data is bound, I thought a default landing page (or watermark) should be shown ?

I just see a blank visual.

Questions:

• Is there a default watermark. If yes how is it enabled?
• Otherwise how do I set a custom landing page / watermark ?

I tried setting these values in the capabilities.json as suggested in some docs and posts:

    "supportsLandingPage": true,
    "supportsEmptyDataView": true

But nothing changes.

Also this page doesn't give me a working code example for a custom landing page: https://learn.microsoft.com/en-nz/power-bi/developer/visuals/landing-page 

Maybe someone has a other example ?

Thanks,

Markus