Support unknown state, position or tilt for template cover

[jbouwh]

Proposed change

Allow the state, current_cover_position or current_cover_tilt_position to be unknown. Without the PR an error will be logged, reporting an invalid state update.

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 template.cover reports bogus errors but only for one item and only when you reload manually configured mqtt items #91139
• This PR is related to issue:
• Link to documentation pull request: Allow an unknown state, position or tilt for template cover home-assistant.io#26939

Checklist

• The code change is tested and works locally.
• Local tests pass. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.
• I have followed the development checklist
• I have followed the perfect PR recommendations
• The code has been formatted using Black (black --fast homeassistant tests)
• 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

If the code communicates with devices, web services, or third-party tools:

• The manifest file has all fields filled out correctly.
  Updated and included derived files by running: python3 -m script.hassfest.
• New or updated dependencies have been added to requirements_all.txt.
  Updated by running python3 -m script.gen_requirements_all.
• For the updated dependencies - a link to the changelog, or at minimum a diff between library versions is added to the PR description.
• Untested files have been added to .coveragerc.

To help with the load of incoming pull requests:

• I have reviewed two other open pull requests in this repository.

[home-assistant]

Hey there @PhracturedBlue, @tetienne, @home-assistant/core, mind taking a look at this pull request as it has been labeled with an integration (template) you are listed as a code owner for? Thanks!

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[tetele]

Tested using the following config, working well.

cover:
  - platform: template
    covers:
      garage_door:
        device_class: garage
        friendly_name: "Garage Door"
        position_template: "{{ None }}"
        tilt_template: "{{ None }}"
        open_cover:
          service: input_boolean.turn_on
          data:
            entity_id: input_boolean.cover_switch
        close_cover:
          service: input_boolean.turn_off
          data:
            entity_id: input_boolean.cover_switch