return 404 on no data for blogposts/events

src/app/[locale]/blog/[slug]/page.tsx

@@ -41,6 +41,8 @@ export async function generateMetadata({
   const { slug } = await params
   const data = await getBlogPost(slug)
 
+  if (!data) notFound()
+
   return generateSeoMetadata({
     title: data.title,
     description: data.excerpt,

src/app/[locale]/event/[slug]/page.tsx

@@ -25,6 +25,8 @@ export async function generateMetadata({
   const { slug } = await params
   const data = await getEvent(slug)
 
+  if (!data) notFound()
+
   const locale = await getLocale()
   const t = await getTranslations("metaTags")