Fold an if-else into a terniary operator

		"""

		Add a network interface to the daemon's control interfaces

		"""

		if self.ctrl_dir:

			ctrl_iface = f"DIR={self.ctrl_dir} GROUP={self.ctrl_dir.group()}"

		else:

			# RuntimeError should be raised by send_command() as connect() does not appear

			# to have been called; set ctrl_iface to any string

			ctrl_iface = ""

		await self.send_command(

			consts.COMMAND_INTERFACE_ADD, ifname, "", driver, ctrl_iface, driver_param,

			consts.COMMAND_INTERFACE_ADD, ifname, "", driver,

			f"DIR={self.ctrl_dir} GROUP={self.ctrl_dir.group()}" if self.ctrl_dir else "",

			driver_param,

		)

		assert self.ctrl_dir is not None, \

			"RuntimeError should be raised for sends on unconnected clients; " \