"""
homeassistant.components.notify.googlevoice
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Google Voice SMS platform for notify component.

For more details about this platform, please refer to the documentation at
https://home-assistant.io/components/notify.free_mobile/
"""
import logging
from homeassistant.helpers import validate_config
from homeassistant.components.notify import (
    DOMAIN, ATTR_TARGET, BaseNotificationService)
from homeassistant.const import CONF_USERNAME, CONF_PASSWORD

_LOGGER = logging.getLogger(__name__)
REQUIREMENTS = ['https://github.com/w1ll1am23/pygooglevoice-sms/archive/'
                '7c5ee9969b97a7992fc86a753fe9f20e3ffa3f7c.zip#'
                'pygooglevoice-sms==0.0.1']


def get_service(hass, config):
    """ Get the Google Voice SMS notification service. """

    if not validate_config({DOMAIN: config},
                           {DOMAIN: [CONF_USERNAME,
                                     CONF_PASSWORD]},
                           _LOGGER):
        return None

    return GoogleVoiceSMSNotificationService(config[CONF_USERNAME],
                                             config[CONF_PASSWORD])


# pylint: disable=too-few-public-methods
class GoogleVoiceSMSNotificationService(BaseNotificationService):
    """ Implements notification service for the Google Voice SMS service. """

    def __init__(self, username, password):
        from googlevoicesms import Voice
        self.voice = Voice()
        self.username = username
        self.password = password

    def send_message(self, message="", **kwargs):
        """ Send SMS to specified target user cell. """

        targets = kwargs.get(ATTR_TARGET)

        if not isinstance(targets, list):
            targets = [targets]

        self.voice.login(self.username, self.password)

        for target in targets:
            self.voice.send_sms(target, message)

        self.voice.logout()

@@ -1670,16 +1670,118 @@
 ARGET)%0A%0A
+        if not targets:%0A            _LOGGER.info('At least 1 target is required')%0A            return%0A%0A
         

Log if target == NULL