Fixes error due to missing date

src/layouts/BlogPost.astro

@@ -20,7 +20,7 @@ const { title, description, pubDate, updatedDate, heroImage } = Astro.props;
 				<div class="prose">
 					<div class="title">
 						<div class="date">
-							<FormattedDate date={pubDate} />
+              { pubDate && <FormattedDate date={pubDate} /> }
 							{
 								updatedDate && (
 									<div class="last-updated-on">

src/pages/blog/index.astro

@@ -1,12 +1,15 @@
 ---
 import NotchedBox from '../../components/NotchedBox.astro';
 import RootLayout from '../../layouts/RootLayout.astro';
-import { getCollection } from 'astro:content';
+import { getCollection, type CollectionEntry } from 'astro:content';
 import FormattedDate from '../../components/FormattedDate.astro';
 import { Image } from 'astro:assets';
 
-const posts = (await getCollection('blog'))
-  .filter(p => p.data.pubDate)
+function publishedOnly(p: CollectionEntry<'blog'>): p is (CollectionEntry<'blog'> & { data: { pubDate: Date }}) {
+  return p.data.pubDate !== undefined;
+}
+
+const posts = (await getCollection('blog', publishedOnly))
   .sort(
     (a, b) => b.data.pubDate.valueOf() - a.data.pubDate.valueOf(),
   );
@@ -57,7 +60,8 @@ const posts = (await getCollection('blog'))
                   { post.data.description && 
                     <p class="description">
                       {post.data.description}
-                  </p>}
+                    </p>
+                  }
                 </div>
               </NotchedBox>
             </a>