Yield in partial

partial.html.haml

# Problem: block_given always retruns true, either I call the partial with or without a block...
- if block_given?
  #hidden_deletion_element= yield
- else
  = link_to(deletion_path, method: :delete, confirm: 'Are you sure?', id: :hidden_deletion_element) { "Delete Me"}

# in application helper
<% content_for? :not_authorized do %>
  <%= yield :not_authorized %>
<% end %>

# then in your view, you will call

<% content_for :not_authorized do%>
 <% your code %>
<% end %>