Fix bugs and errors

lib/posts.lua

@@ -49,7 +49,7 @@ for file in restia.utils.files(params.input, "^./posts/.*%.md$") do
 		post.head.tags = string.split(post.head.tags, "[%a-]+")
 	end
 
-	for key, tag in ipairs(post.head.tags) do
+	for key, tag in ipairs(post.head.tags or {}) do
 		post.head.tags[key] = string.lower(tag)
 	end
 

pages/index.html.skooma.yue

@@ -23,7 +23,7 @@ slots.head
 slots.head script type: 'module', src: "/javascript/LocalDate.js"
 slots.head script type: 'module', src: "/javascript/BlogPost.js"
 
-return div
+return main
 	class: "content-width"
 	* h1 "Blog Posts"
 	* [blogPost post p for p in *posts]

templates/post.html.skooma.yue

@@ -29,7 +29,7 @@ positions = (input, character) ->
 
 breadcrumb = (href) -> li a :href, href\match('[^/]+$'), tabindex: 0
 
-if src = post.head.cover_image
+if src := post.head.cover_image
 	slots.top pageHero cover: 60
 		* img :src, style: 'opacity: .4'
 		* h1(post.head.title, style: "view-transition-name: #{post.head.slug}")