title: Django: empty comment form error handling
body: <p>I use standart django comments framework.</p>
  
  <p>template:</p>
  
  <pre><code>&lt;h2&gt;Add comment&lt;/h2&gt; {%  get_comment_form for post as form %} 
  &lt;form  action="{% comment_form_target %}" method="post" &gt; {% csrf_token %}   
  {{form.content_type}}{{form.object_pk}}{{form.timestamp}}{{form.security_hash}}
  Comment:&lt;br /&gt;
  {{form.comment}}
  
  &lt;input type="hidden" name="next" value="{{ request.get_full_path }}#comment" /&gt; 
  
  &lt;button class="btn btn-large btn-primary" type="submit"&gt;Post&lt;/button&gt;
  
  &lt;/form&gt;
  </code></pre>
  
  <p>urls:</p>
  
  <pre><code>(r'^comments/', include('django.contrib.comments.urls')),
  </code></pre>
  
  <p>Then I send empty form, I redirect to /comments/post/ page.
  How can I just reload current page and add error message? Thx!</p>