Ticket #15889: django_ticket_15889.patch

django/core/serializers/__init__.py

@@ -63 +63 @@
     del _serializers[format]
 
 def get_serializer(format):
+    if format in get_serializer_formats():
+        raise SerializerNotFound()
     if not _serializers:
         _load_serializers()
     return _serializers[format].Serializer

django/core/serializers/base.py

@@ -8 +8 @@
 from django.utils.encoding import smart_str, smart_unicode
 from django.utils import datetime_safe
 
+class SerializerNotFound(Exception):
+    """A requested serializer was not found."""
+    pass
+
 class SerializationError(Exception):
     """Something bad happened during serialization."""
     pass