Don’t list articles without a template

Closes #250

examples/blog/plugins/paginator.coffee

@@ -19,6 +19,9 @@ module.exports = (env, callback) ->
     # helper that returns a list of articles found in *contents*
     # note that each article is assumed to have its own directory in the articles directory
     articles = contents[options.articles]._.directories.map (item) -> item.index
+    # skip articles that does not have a template associated
+    articles = articles.filter (item) -> item.template isnt 'none'
+    # sort article by date
     articles.sort (a, b) -> b.date - a.date
     return articles