Redirect invalid filter urls to base_redirect

researchquestions/website/filters/urls.py

@@ -3,7 +3,9 @@ from django.conf.urls import patterns, include, url
 urlpatterns = patterns('website.filters.views',
 
     #### Available filters
-    url(r'^class/(?P<class>\w+)$', 'filter_class', name='filter_class'),
+    url(r'^$', 'base_redirect'),
+    url(r'^section/(?P<section>\w+)$', 'filter_section', name='filter_section'),
+    url(r'^section/?$', 'base_redirect'),
     url(r'^date$', 'filter_date', name='filter_date'),
     url(r'^comments$', 'filter_comments', name='filter_comments'),