message: fix(blog): add null fallback for undefined lastEdited frontmatter property
diff: @@ -18,7 +18,7 @@ async function processFrontmatter(options) {
  const filePath = path.join(process.cwd(), "pages", mdxPath)
  // get the last edited author and date
  - const lastEdited = await getLastEdited(filePath)
  + const lastEdited = (await getLastEdited(filePath)) || null
  // get the edit url
  const editUrl = getEditUrl(path.join(mdxPath), baseEditUrl)
  