Adding the nova.exeption import to fix the tree

diff --git a/heat/db/sqlalchemy/session.py b/heat/db/sqlalchemy/session.py
index 08806cfee5cb87f6e21a2a863df59997585a1792..c5b89d52455f61f1245de7cf1f0653ebecdea098 100644 (file)
--- a/heat/db/sqlalchemy/session.py
+++ b/heat/db/sqlalchemy/session.py
@@ -13,7 +13,7 @@
 #    under the License.
 
 """Session Handling for SQLAlchemy backend."""
-
+import nova.exception
 import sqlalchemy.interfaces
 import sqlalchemy.orm
 from sqlalchemy.exc import DisconnectionError