c124d0adf24599671d9a6bb42970433d3f369b88
Saving the notifications form with a blank email box while events are enabled wiped the customer's hub-side alert address (SyncPreferences pushed empty) — the 2026-07-15 demo incident. settingsNotificationsHandler now refuses that save before SetNotificationPrefs + hub sync, re-renders a Hungarian error, and repaints the submitted checkboxes. Empty email + zero events (clear-all) still proceeds. Tests + red-proof (remove guard -> stored email wiped to empty).
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