For list view, ensure 'results' in data

Closes #59

Author: pattisdr

rest_framework_json_api/renderers.py

@@ -57,9 +57,11 @@ def render(self, data, accepted_media_type=None, renderer_context=None):
 
         # If detail view then json api spec expects dict, otherwise a list
         # - http://jsonapi.org/format/#document-top-level
-        if view and hasattr(view, 'action') and view.action == 'list':
-            # Check for paginated results
-            results = (data["results"] if isinstance(data, dict) else data)
+        # The `results` key may be missing if unpaginated or an OPTIONS request
+        if view and hasattr(view, 'action') and view.action == 'list' and \
+                isinstance(data, dict) and 'results' in data:
+
+            results = data["results"]
 
             resource_serializer = results.serializer