<ul>
  <%= render partial: "dataset", collection: @datasets %>
</ul>

<ul>
  <%= render(partial: "dataset", collection: @datasets) || "<p class='text-center lead'>You currently have no datasets, why not #{link_to 'add one', new_dataset_path}?</p>".html_safe %>
</ul>

Add message if user has no datasets
Add message if user has no datasets
