Allow HTML to render when no filter_class is defined.

ericholscher · ericholscher · commit 378d6a1a1953 · 2015-10-28T12:39:20.000-07:00
Previously it required a filter_class, or else it would error when calling `cls()`. This now sets the `filter` context to `None` if one does not exist. Fixes #3559
diff --git a/rest_framework/filters.py b/rest_framework/filters.py
@@ -118,7 +118,10 @@ def filter_queryset(self, request, queryset, view):
 
     def to_html(self, request, queryset, view):
         cls = self.get_filter_class(view, queryset)
-        filter_instance = cls(request.query_params, queryset=queryset)
+        if cls:
+            filter_instance = cls(request.query_params, queryset=queryset)
+        else:
+            filter_instance = None
         context = Context({
             'filter': filter_instance
         })
