code: def command_children(self, command):
          
          if not len(self.nodes):
              return
  
          commands = []
          for c in self.nodes:
              commands.append('[con_id="{}"] {};'.format(c.id, command))
  
          self._conn.command(' '.join(commands))
docs: Run a command on the direct children of the currently selected
          container.
  
          :rtype: List of CommandReply????