3b3f5fe6fe2092a5071491fafce11b3851d07ce8,homeassistant/components/notify/xmpp.py,,get_service,#Any#Any#,28

Before Change

                            config[DOMAIN]["recipient"],
                            "")
    except ImportError:
        _LOGGER.exception(
            "Unable to contact jabber server."
            "Please check your credentials.")

        return None

    return XmppNotificationService(config[DOMAIN]["sender"],

After Change

def get_service(hass, config):
     Get the Jabber (XMPP) notification service. 

    if not validate_config({DOMAIN: config},
                           {DOMAIN: ["sender", "password", "recipient"]},
                           _LOGGER):
        return None

Instances