Fix swiss public transport line field none

[miaucl]

Proposed change

Fix #133116, which can occur for some specific connections at some set time of day, which results in no line data available. Instead of catastrophic failure, we will now just get unavailable.

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 Unexpected error fetching swiss_public_transport data #133116
• This PR is related to issue:
• Link to documentation pull request:

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[home-assistant]

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

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[gjohansson-ST]

Thanks @miaucl 👍