Fix excerpt-less posts

lib/generate/posts.ts

@@ -37,8 +37,10 @@ async function generatePostFromFile(postPath: string, additionalMetadata: object
 
 	if (!(<PostMetadata>page.metadata).excerpt) {
 		const parts = page.text.split("<!-- excerpt-end -->");
+		if (parts.length > 1) {
 			(<PostMetadata>page.metadata).excerpt = parts[0];
 		}
+	}
 
 	return page;
 }

site/includes/article-listing.html.ejs

@@ -10,9 +10,11 @@
     </h2>
     <%- include("article-meta.html.ejs", { metadata: post.metadata }) %>
     <div class="article-content" itemprop="description">
-        <%- post.metadata.excerpt %>
+        <%- post.metadata.excerpt ?? post.text %>
     </div>
+	<% if (post.metadata.excerpt) { %>
 		<p class="read-more-link">
 			<a href="<%= post.metadata.permalink%>">Read more...</a>
 		</p>
+	<% } %>
 </article>