feat(layout): hide the element when the page title is empty

Hide the element when the page title is empty

layout/common/article.jsx

@@ -80,9 +80,9 @@ module.exports = class extends Component {
                         </div>
                     </div> : null}
                     {/* Title */}
-                    <h1 class="title is-3 is-size-4-mobile">
+                    {page.title !== '' ? <h1 class="title is-3 is-size-4-mobile">
                         {index ? <a class="link-muted" href={url_for(page.link || page.path)}>{page.title}</a> : page.title}
-                    </h1>
+                    </h1> : null}
                     {/* Content/Excerpt */}
                     <div class="content" dangerouslySetInnerHTML={{ __html: index && page.excerpt ? page.excerpt : page.content }}></div>
                     {/* Licensing block */}