Set proper sensor device class for swiss_public_transport

[miaucl]

Breaking change

The native_value of the sensor is no longer of type str (timestamp string) but a proper datetime. Further, all timestamps and durations in the additional fields are also proper datetime/duration objects.

Proposed change

Set the class of the sensor departure to TIMESTAMP instead of the generic str value and provide the native_value and the additional attributes accordingly.

Also, the values are nullable, as the api sometimes does not have a response to a request. This is now better reflected in a None value instead of an empty str.

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[home-assistant]

Hey there @fabaff, mind taking a look at this pull request as it has been labeled with an integration (swiss_public_transport) you are listed as a code owner for? Thanks!

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[home-assistant]

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[miaucl]

I realized, there might also be (rare) cases where no connection is available, which means connections[0] does not exist, either. Therefore I also check for departure before parsing to datetime.

[gjohansson-ST]

Please don't force push in your changes. Do regular commits so one doesn't have to review from scratch all the time (perhaps not a big deal on this PR but for the future).

[miaucl]

Please don't force push in your changes. Do regular commits so one doesn't have to review from scratch all the time (perhaps not a big deal on this PR but for the future).

Ok, no problem

[gjohansson-ST]

Thanks @miaucl 👍