Commit with test data in migration.

nova/exception.py

@@ -318,6 +318,9 @@ class InvalidEc2Id(Invalid):
 class NotFound(NovaException):
     message = _("Resource could not be found.")
 
+    def __init__(self, *args, **kwargs):
+        super(NotFound, self).__init__(**kwargs)
+
 
 class FlagNotSet(NotFound):
     message = _("Required flag %(flag)s not set.")