Catch error if input_datetime state is incorrect

[bramkragten]

Proposed change

Apparently the attributes can be missing...

Fixes home-assistant/core#57401

Type of change

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

Example configuration

Additional information

• This PR fixes or closes issue: fixes #
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Checklist

• The code change is tested and works locally.
• There is no commented out code in this PR.
• Tests have been added to verify that the new code works.

If user exposed functionality or configuration variables are added/changed:

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[balloob]

The attributes can't miss: https://github.com/home-assistant/core/blob/dev/homeassistant/components/input_datetime/__init__.py#L347-L351

I think that the right approach is to expose those has_time and has_date as capability_attributes in core, such that they are also restored when an input-datetime with a unique ID is removed without cleaning up the entity registry.

[balloob]

Core PR home-assistant/core#58138

[bramkragten]

The issue here was that the entity was actually removed from home assistant, so all attributes where missing...

[balloob]

If the entity is removed, it is restored from the entity registry. The capability attributes are part of that restored entity.