ignore sub-articles without lemmas

src/components/Article.vue

@@ -52,9 +52,8 @@ function find_sub_articles(definition) {
     sub_art_list = sub_art_list.concat(find_sub_articles(subdef))
   })
 
-  let sub_articles = definition.elements.filter(el => el.type_ == 'sub_article')
+  let sub_articles = definition.elements.filter(el => el.type_ == 'sub_article' && el.lemmas)
   sub_art_list = sub_art_list.concat(sub_articles)
-
   return sub_art_list
 }