Add removal condition to Shelly battery sensor

[bieniu]

Breaking change

Proposed change

Firmware 1.2.10 for Shelly Wall Display, for unknown reasons, sends information about the battery battery: None in the status, which causes an exception.
This PR adds a removal condition for the battery sensor which solves the problem, the sensor battery is removed if the battery value is None.

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New integration (thank you!)
• New feature (which adds functionality to an existing integration)
• Deprecation (breaking change to happen in the future)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue: fixes Unexpected error fetching Shelly Wall Display: 'NoneType' object is not subscriptable #113591 Shelly Wall display show not available #113561
• This PR is related to issue:
• Link to documentation pull request:

Checklist

• The code change is tested and works locally.
• Local tests pass. Your PR cannot be merged unless tests pass
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• Tests have been added to verify that the new code works.

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• Documentation added/updated for www.home-assistant.io

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[home-assistant]

Hey there @balloob, @thecode, @chemelli74, @bdraco, mind taking a look at this pull request as it has been labeled with an integration (shelly) you are listed as a code owner for? Thanks!

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[chemelli74]

Thx!

[thecode]

Tested on WallDisplay with FW 1.2.10 - 20240314-130650/1.2.10-889ff162, reproduced before the fix and not reproduced after. Thanks

[bieniu]

Thanks @chemelli74 @thecode