--- a/cubicweb/web/views/editforms.py	Thu Mar 23 12:09:59 2017 +0100
+++ b/cubicweb/web/views/editforms.py	Tue Mar 07 13:13:23 2017 +0100
@@ -123,7 +123,8 @@
                     content = tags.a(centity.view('textoutofcontext'),
                                      href=centity.absolute_url())
                 else:
-                    w(u'<li class="last">%s</li></ul>' % content)
+                    if content is not None:
+                        w(u'<li class="last">%s</li></ul>' % content)
             w(u'</li>\n')
         w(u'</ul>\n')
         form.render(w=self.w)