Simplify fully closed or fully open check

[piitaya]

Proposed change

Check != null instead of undefined and null.

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 #
• This PR is related to issue or discussion:
• Link to documentation pull request:

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:

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

[steverep]

If current_position can be null for either of these, then the types are incorrect and should be adjusted as well.

[home-assistant]

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[piitaya]

If current_position can be null for either of these, then the types are incorrect and should be adjusted as well.

Oh right! I was following #19278. I agree, we should fix the issue in core to not return null. And if we figure out it's not a core issue, we must adapt the typings!

I will close this PR for now.