Fix pairing with HK accessories that do not provide format for vendor chars

[bdraco]

Proposed change

Fixes #76104

Changelog: Jc2k/aiohomekit@1.2.6...1.2.7

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)
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Additional information

• This PR fixes or closes issue: fixes #
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Checklist

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[probot-home-assistant]

Hey there @Jc2k, mind taking a look at this pull request as it has been labeled with an integration (homekit_controller) you are listed as a code owner for? Thanks!
_{^{(message by CodeOwnersMention)}}

[Jc2k]

LGTM