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-rw-r--r--lib/sqlalchemy/orm/util.py3
1 files changed, 2 insertions, 1 deletions
diff --git a/lib/sqlalchemy/orm/util.py b/lib/sqlalchemy/orm/util.py
index 8694705a4..fd902adaf 100644
--- a/lib/sqlalchemy/orm/util.py
+++ b/lib/sqlalchemy/orm/util.py
@@ -12,7 +12,8 @@ from . import attributes
import re
from .base import instance_str, state_str, state_class_str, attribute_str, \
- state_attribute_str, object_mapper, object_state, _none_set
+ state_attribute_str, object_mapper, object_state, _none_set, \
+ _none_tuple
from .base import class_mapper, _class_to_mapper
from .base import _InspectionAttr
from .path_registry import PathRegistry