change unknown to None in Netatmo public

[Danielhiversen]

Description:

Fix this comment: #16671 (review) from @MartinHjelmare

Checklist:

• The code change is tested and works locally.
• Local tests pass with tox. Your PR cannot be merged unless tests pass

[MartinHjelmare]

Thanks!

[GP8x]

Thanks for picking this up. Out of curiosity what is the intended purpose for ‘’’STATE_UNKNOWN’’’ over None ?

[MartinHjelmare]

STATE_UNKNOWN is used by the base entity class and written to the state machine when the entity state property returns None. We should let the core handle it like that.

[GP8x]

Awesome, thanks for the explanation.