Unavailable command can still be invoked and executed by clicking corresponding button

[nergal-perm]

Should check for command availability.

That probably can be done in modal form. Also the state of the final button should be updated as user types values for command arguments

[nergal-perm]

Yeah, the request for the command can be sent, but nothing happens, because the command is not available (no rule with ASG cells is satisfied). So that's not a problem at all, issue can be closed.