core: Exception in Google Assistant with ESPHome binary light in 2021.4.3

The problem

Repro:

• Use a ESPHome 1.16.2 binary light; https://esphome.io/components/light/binary.html. In the logs below, light.tour_eiffel is a binary light.
• Use google assistant integration.
• Restart home assistant.

Actual:

2021-04-11 19:37:24 ERROR (MainThread) [homeassistant.components.google_assistant.smart_home] Error serializing light.tour_eiffel
Traceback (most recent call last):
  File "/usr/src/homeassistant/homeassistant/components/google_assistant/helpers.py", line 517, in sync_serialize
    device["attributes"].update(trt.sync_attributes())
  File "/usr/src/homeassistant/homeassistant/components/google_assistant/trait.py", line 385, in sync_attributes
    "temperatureMaxK": color_util.color_temperature_mired_to_kelvin(
  File "/usr/src/homeassistant/homeassistant/util/color.py", line 513, in color_temperature_mired_to_kelvin
    return math.floor(1000000 / mired_temperature)
ZeroDivisionError: float division by zero

https://github.com/home-assistant/core/blob/2021.4.3/homeassistant/components/google_assistant/trait.py#L381 The light doesn’t support color temperature, so it’s not expected that this condition is true.

What is version of Home Assistant Core has the issue?

core-2021.4.3

What was the last working version of Home Assistant Core?

core-2021.3.4

What type of installation are you running?

Home Assistant Container

Integration causing the issue

google_assistant

Link to integration documentation on our website

https://www.home-assistant.io/integrations/google_assistant/

Example YAML snippet

The esphome yaml file:


(...)
light:
  - platform: binary
    name: "Tour Eiffel"
    id: lumieres_2
    output: output_2
output:
  - platform: esp8266_pwm
    id: output_2
    pin: D3

### Anything in the logs that might be useful for us?

_No response_