Fix: fritzbox error when response contains empty values

[evorg]

Proposed change

Make the fritzbox proxy more robust, that missing or empty properties does not result in an error.

Closes #2461

Type of change

• New service widget
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Documentation only
• Other (please explain)

Checklist:

• If applicable, I have added corresponding documentation changes.
• If applicable, I have reviewed the feature and / or service widget guidelines.
• I have checked that all code style checks pass using pre-commit hooks and linting checks.
• If applicable, I have tested my code for new features & regressions on both mobile & desktop devices, using the latest version of major browsers.

[shamoon]

Some ugly optional chaining but suppose thats what happens with xml

Thanks for the fast fix =)

[github-actions]

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