Handle LinkPlay devices with no mac

[silamon]

Proposed change

There is an issue that provides a diagnostic file for a LinkPlay device that apparantly has no mac address. While that's not really what the api documentation mentions, I think it can be accepted to make the integration more error prone to handle this.

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 Cant config Linkplay with my Edifier MA3 #135488
• This PR is related to issue:
• Link to documentation pull request:

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[home-assistant]

Hey there @Velleman, mind taking a look at this pull request as it has been labeled with an integration (linkplay) you are listed as a code owner for? Thanks!

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[frenck]

I've marked this PR as draft, as changes are requested that need to be processed.
Please un-draft it once it is ready for review again by clicking the "Ready for review" button.

Thanks! 👍

../Frenck

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[frenck]

Thanks, @silamon 👍

../Frenck