Fix choose description when a non-list form of conditions is used

[karwosts]

Breaking change

Fix choose description generation when conditions is not a list. This can't happen through the UI editor, but it is a valid yaml syntax.

Proposed change

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

choose:
  - sequence: []
    conditions:
      condition: sun
      before: sunrise
enabled: true

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

[piitaya]

Thank you!