optional chaining (?.) to prevent the crash for footer.tsx

[sancheet230]

Closes #262

The application crashes if FOOTER_SECTION.sections is undefined or null. This happens because .map() is being used without checking if sections exist

Changes

Added optional chaining (?.) to check if FOOTER_SECTION.sections exists before calling .map()

Flags

Provided a fallback message "No links available" if FOOTER_SECTION.sections is undefined or null.

Author Checklist

• Ensure you provide a DCO sign-off for your commits using the --signoff option of git commit.
• Vital features and changes captured in unit and/or integration tests
• Commits messages follow AP format
• Extend the documentation, if necessary
• Merging to main from fork:branchname

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[sancheet230]

@DianaLease @sanketshevkar That's all from my side you can review this out