python3: use force_text to make sure variables are strings

combo/utils/urls.py

@@ -17,6 +17,7 @@
 import re
 
 from django.conf import settings
+from django.utils.encoding import force_text
 from django.template import Context, Template, TemplateSyntaxError, VariableDoesNotExist
 from django.utils.http import quote
 
@@ -58,5 +59,5 @@ def get_templated_url(url, context=None):
             return '['
         if varname not in template_vars:
             raise TemplateError('unknown variable %s', varname)
-        return unicode(template_vars[varname])
+        return force_text(template_vars[varname])
     return re.sub(r'(\[.+?\])', repl, url)