Fixed #15230 -- added some more attributes to the dummy database backend.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@15440 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/db/backends/dummy/base.py

@@ -52,5 +52,9 @@ class DatabaseWrapper(object):
         self.settings_dict = settings_dict
         self.alias = alias
 
+        self.transaction_state = []
+        self.savepoint_state = 0
+        self.dirty = None
+
     def close(self):
         pass