FR: Add msg.payload as input for Open App node

[IOIO72]

I've created a dropdown, which lists all Apps I got from the Get Apps node. I configured to open the selected app by appId via the Open App node, where I left the App selector empty.
I assumed that it will open the App with the appId in the msg.payload. But this is not the case.

The Open App node should take the payload, if no app is selected.