Updated `formatBreadcrumb` to fall back to an empty string if the `useAsTitle` field for the document is undefined. This handles cases where the field is optional or not filled out, ensuring the label is never `undefined`. Fixes #10377
Updated `formatBreadcrumb` to fall back to an empty string if the `useAsTitle` field for the document is undefined. This handles cases where the field is optional or not filled out, ensuring the label is never `undefined`. Fixes #10377