Mandate with no end date = present

representatives/templatetags/representatives_tags.py

@@ -24,7 +24,7 @@ def chamber_icon(chamber):
 
 @register.filter
 def mandate_date(date, arg=None):
-    if date.year == 9999:
+    if date is None or date.year == 9999:
         return 'present'
     else:
         return naturalday(date, arg)