title: How can I know if a non-required RenderSection exists?
body: <pre><code>@* Omitted code.. *@
  @RenderBody()
  @RenderSection("Sidebar", required: false)
  </code></pre>
  
  <p>Is there any way to know in the <code>Omitted code</code> part if the RenderSection <code>Sidebar</code> exists or not?</p>