<% @title=@part.title %>
<h1><%= @part.title %></h1>
<% if !@part.prologue.nil? %>
<h2><%= @part.prologue %></h2>
<% end %>
<ul>
<% @part.treatises.each do |treatise| %>
  <li><%= treatise.title %></li>
<% end %>
</ul>

<% if !@part.nil? %>
  <% @title=@part.title %>
  <h1><%= @part.title %></h1>
  <% if !@part.prologue.nil? %>
    <h2><%= @part.prologue %></h2>
  <% end %>
  <ul>
  <% @part.treatises.each do |treatise| %>
    <li><%= treatise.title %></li>
  <% end %>
  </ul>
<% end %>

Fix the test which checks for an attempt to show a part without an ID.
Fix the test which checks for an attempt to show a part without an ID.
