Account for disabled ZHA discovery config entries when migrating SkyConnect integration

[puddly]

Proposed change

Disabled ZHA discovery entries do not contain any data, which broke the SkyConnect integration's attempts to detect the firmware type. This PR handles the missing dictionary keys.

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 SkyConnect Integration - Startup Error but SkyConnect works just fine. #116823
• This PR is related to issue:
• Link to documentation pull request:

Checklist

• The code change is tested and works locally.
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• Tests have been added to verify that the new code works.

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  Updated by running python3 -m script.gen_requirements_all.
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[home-assistant]

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

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