code: func onlyIDQuery(q *protocol.KontrolQuery) bool {
  	fields := q.Fields()
  
  	// check if any other key exist, if yes return a false
  	for _, k := range keyOrder {
  		v := fields[k]
  		if k != "id" && v != "" {
  			return false
  		}
  	}
  
  	// now all other keys are empty, check finally for our ID
  	if fields["id"] != "" {
  		return true
  	}
  
  	// ID is empty too!
  	return false
  }
docs: // onlyIDQuery returns true if the query contains only a non-empty ID and all
  // others keys are empty