Send a reply when trying to execute a command not allowed?

[maartenbreddels]

If a kernel handler gets a msg that is not allowed (for instance voila gets an execute_request) there is no reply. For testing or UI it makes sense to get a reply.

Is there an example that I could use on how such a reply should look like? I guess this also means the protocol description should be updated?

[SylvainCorlay]

Maybe a proper reply satisfying the schema should be used.