* Add a base_url configuration setting to tts. * Remove the empty string as default value for base_urls As requested in https://github.com/home-assistant/home-assistant/pull/16478#pullrequestreview-153526144
* Add a base_url configuration setting to tts. * Remove the empty string as default value for base_urls As requested in https://github.com/home-assistant/home-assistant/pull/16478#pullrequestreview-153526144