A category/product facade error propagated through switchMap
uncaught, erroring the shared widget stream (shareReplay) in
WidgetHostService with no fallback - the widget just silently failed
to render, and the error stayed cached for every later subscriber.
Added catchError falling back to an empty { section, settings } shape,
same pattern as the widget-manifest fetch (falls back to { widgets: [] }
on any error, never throws to the UI).
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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