python3: get HTML parser from six transition module

combo/data/models.py

@@ -699,7 +699,7 @@ class CellBase(models.Model):
         }
         if not self.is_relevant(context):
             return ''
-        from HTMLParser import HTMLParser
+        from django.utils.six.moves.html_parser import HTMLParser
         return HTMLParser().unescape(strip_tags(self.render(context)))
 
     def get_external_links_data(self):

combo/utils/misc.py

@@ -14,7 +14,7 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-from HTMLParser import HTMLParser
+from django.utils.six.moves.html_parser import HTMLParser
 
 from django.template.context import BaseContext
 from django.utils.html import strip_tags