TypeError in switch.py during reload: object NoneType can't be used in 'await' expression #14

Hello,

The integration produces a recurring TypeError in the logs, especially during Home Assistant restarts or when integrations are reloaded.

Here is the full traceback from the logs:

Logger: homeassistant
Source: custom_components/hisense_ac_plugin/switch.py:474
Integration: Hisense Air Conditioner

Traceback:
Error doing job: Task exception was never retrieved (None)
Traceback (most recent call last):
File "/config/custom_components/hisense_ac_plugin/switch.py", line 474, in _async_schedule_update
await self.async_schedule_update_ha_state(True)
TypeError: object NoneType can't be used in 'await' expression

Thank you for your work on this integration and for looking into this issue.