should use entity, not self.entity (which is a function)

views.py

@@ -101,7 +101,7 @@
 
     def cell_call(self, row, col, **kwargs):
         entity = self.cw_rset.get_entity(row, col)
-        self.w(u'[%s] ' % self.entity.view('commentroot'))
+        self.w(u'[%s] ' % entity.view('commentroot'))
         self.w(u'<a href="%s"><i>%s</i></a>\n' % (
             xml_escape(entity.absolute_url()),
             entity.view('commentsummary')))