Homogenize commandHandler response
I think it's necessary that commandHandler always returns same structure allowing to respond something in UI.
I mean when i click on/off on a switch on the dashboard, nothing is returned (no error, no info).
If commandHandler returns something like:
- more:<custom structure (map, string...)>
UI can display an success/error message with specified msg.
"more" parameters will be used by controllers to return something more.