Handle missing footer menu better

[marcoacierno]

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Project	Deployment	Actions	Updated (UTC)
pycon	Ready	Preview	Jun 20, 2026 7:39pm

[claude]

Fixes a null-crash in the footer when the backend returns null for a missing menu (the API returns null when no menu with that identifier is configured for a conference).

No frontend tests for the null-menu case. The bug this PR fixes had no test, and the fix also has no test. If footerEn or footerIt is null (a real scenario confirmed by the backend test at backend/api/tests/schema/conference/test_menu.py), there's nothing preventing a regression. A snapshot or render test that passes null menus would catch this.

Same class of bug exists in the header. frontend/src/components/header/index.tsx destructures data || { conference: {} } — if data is defined but data.conference is null, that destructure throws. The individual ?? [] guards on links access don't protect against this. Worth fixing in a follow-up.