added new blog post

src/routes/blog/+page.svelte

@@ -7,10 +7,14 @@
     let entries: GalleryEntry[] = posts.map(mapEntries);
 
     function mapEntries(entry: BlogPostLink, index: number): GalleryEntry {
+        let banner = "";
+        if (entry.post.banner && entry.post.banner !== "") {
+            banner = `/blog/${entry.key}/${entry.post.banner}`;
+        }
         return {
             title: `${entry.post.title}`,
             subtitle: `#${posts.length - index} // ${entry.post.date}, ${entry.post.time}`,
-            img: `/blog/${entry.key}/${entry.post.banner}`,
+            img: banner,
             link: `/blog/${entry.key}/`,
             imgAlt: `Preview image for ${entry.post.title}`,
         };