Allow the highlights attribute of articles to be undefined

packages/web/components/templates/article/ArticleContainer.tsx

@@ -520,7 +520,7 @@ export function ArticleContainer(props: ArticleContainerProps): JSX.Element {
         viewer={props.viewer}
         item={props.article}
         scrollToHighlight={highlightHref}
-        highlights={props.article.highlights}
+        highlights={props.article.highlights ?? []}
         isAppleAppEmbed={props.isAppleAppEmbed}
         highlightBarDisabled={props.highlightBarDisabled}
         showHighlightsModal={props.showHighlightsModal}

packages/web/lib/networking/library_items/useLibraryItems.tsx

@@ -982,7 +982,7 @@ export type ArticleAttributes = {
   folder: string
   savedByViewer?: boolean
   content: string
-  highlights: Highlight[]
+  highlights?: Highlight[]
   linkId: string
   labels?: Label[]
   state?: State