core: Mold_indicator errors at HA startup

Home Assistant release with the issue:

0.75.3 but is has been there before Last working Home Assistant release (if known):

none, always been there I guess Operating environment (Hass.io/Docker/Windows/etc.):

Hassio, Hassos Component/platform:

https://www.home-assistant.io/components/sensor.mold_indicator/ Description of problem:

on each HA startup the mold indicator needs values that aren’t available yet, and throws these errors: not sure if the statistics errors are related, but they always appear together . Ive tried to use template values for the component, but it can only use the real sensor names, and no value_templates, or template sensors made up of another template.

8-09-18 23:32:00 ERROR (SyncWorker_3) [homeassistant.components.sensor.mold_indicator] Unable to parse sensor temperature: unknown
2018-09-18 23:32:00 ERROR (SyncWorker_18) [homeassistant.components.sensor.mold_indicator] Unable to parse sensor humidity: unknown
2018-09-18 23:32:02 ERROR (MainThread) [homeassistant.components.sensor.statistics] mean requires at least one data point
2018-09-18 23:32:02 ERROR (MainThread) [homeassistant.components.sensor.statistics] variance requires at least two data points
2018-09-18 23:32:02 ERROR (MainThread) [homeassistant.components.sensor.statistics] variance requires at least two data points

also, and again not sure if this is the same error, because I cant find any pointers to its origin, this happens a bit later:

2018-09-18 23:35:54 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/local/lib/python3.6/site-packages/homeassistant/util/__init__.py", line 325, in wrapper
    result = method(*args, **kwargs)
TypeError: update() takes 1 positional argument but 2 were given
2018-09-18 23:35:54 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/local/lib/python3.6/site-packages/homeassistant/util/__init__.py", line 325, in wrapper
    result = method(*args, **kwargs)
TypeError: update() takes 1 positional argument but 2 were given
2018-09-18 23:35:54 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/local/lib/python3.6/site-packages/homeassistant/util/__init__.py", line 325, in wrapper
    result = method(*args, **kwargs)
TypeError: update() takes 1 positional argument but 2 were given
2018-09-18 23:35:54 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/local/lib/python3.6/site-packages/homeassistant/util/__init__.py", line 325, in wrapper
    result = method(*args, **kwargs)
TypeError: update() takes 1 positional argument but 2 were given

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

- platform: mold_indicator
  name: Schimmel sensor
  indoor_temp_sensor: sensor.temperatuur_living
  indoor_humidity_sensor: sensor.luchtvochtigheid_living
  outdoor_temp_sensor: sensor.rsd_temperature
  calibration_factor: 1.16

Traceback (if applicable):

Additional information: