title: Can't reverse match url in Admin Changeform
body: <p>I read lot's of docs, tried everything and still can't understand why my template returns Reverse for '' with arguments '(1,)' and keyword arguments '{}' not found error. Please see error dump here: <a href="http://dpaste.com/721187/" rel="noreferrer">http://dpaste.com/721187/</a></p>
  
  <p>The tag I use in change_form.html template is {% url pdfview 1 %}</p>
  
  <p>The class FVatAdmin(admin.ModelAdmin) has get_urls method which looks like this:</p>
  
  <pre><code>def get_urls(self):
      urls = super(FVatAdmin, self).get_urls()
      my_urls = patterns('',
         url(r'^view/(?P&lt;id&gt;\d+)', self.admin_site.admin_view(self.pdf_view), name="pdfview"),
         url(r'^js/calculate', self.admin_site.admin_view(self.calculate), name="calc"),
          )
      return my_urls + urls
  </code></pre>
  
  <p>The url and pdfview defined above work just fine, but somewhat don't resolve via {% url pdfview 1 %} in a template and via reverse('pdfview', args={1}) in a view or via shell.</p>
  
  <p>I just can't understand what I'm doing wrong. I'm a newbie in Django... H E L P :)</p>