core: Waze throws unhandled exception upon startup

Home Assistant release with the issue:

0.78

Last working Home Assistant release (if known):

Unknown

Operating environment (Hass.io/Docker/Windows/etc.):

Docker

Component/platform:

https://www.home-assistant.io/components/sensor.waze_travel_time/

Description of problem:

Upon startup, the Waze Travel Time sensor throws an unhandled exception.

Problem-relevant configuration.yaml entries and (fill out even if it seems unimportant):

sensor:
  - platform: waze_travel_time
    name: Travel Time
    origin: device_tracker.my_iphone
    destination: zone.home
    region: US

Traceback (if applicable):

018-09-17 14:35:22 ERROR (MainThread) [homeassistant.core] Error doing job: Future exception was never retrieved
Traceback (most recent call last):
  File "/usr/local/lib/python3.6/concurrent/futures/thread.py", line 56, in run
    result = self.fn(*self.args, **self.kwargs)
  File "/usr/src/app/homeassistant/components/sensor/waze_travel_time.py", line 74, in <lambda>
    EVENT_HOMEASSISTANT_START, lambda _: sensor.update())
  File "/usr/src/app/homeassistant/components/sensor/waze_travel_time.py", line 204, in update
    routes = params.calc_all_routes_info(real_time=self._realtime)
  File "/usr/local/lib/python3.6/site-packages/WazeRouteCalculator/WazeRouteCalculator.py", line 145, in calc_all_routes_info
    routes = self.get_route(npaths, time_delta)
  File "/usr/local/lib/python3.6/site-packages/WazeRouteCalculator/WazeRouteCalculator.py", line 95, in get_route
    response_json = response.json()
  File "/usr/local/lib/python3.6/site-packages/requests/models.py", line 896, in json
    return complexjson.loads(self.text, **kwargs)
  File "/usr/local/lib/python3.6/site-packages/simplejson/__init__.py", line 518, in loads
    return _default_decoder.decode(s)
  File "/usr/local/lib/python3.6/site-packages/simplejson/decoder.py", line 370, in decode
    obj, end = self.raw_decode(s)
  File "/usr/local/lib/python3.6/site-packages/simplejson/decoder.py", line 400, in raw_decode
    return self.scan_once(s, idx=_w(s, idx).end())
simplejson.errors.JSONDecodeError: Expecting value: line 1 column 1 (char 0)

Additional information: