Updated openstack/openstack
Project: openstack/heat  2ed4b0cbfcd35b99a15428b5f6d8b17bf2624bd6

Fix outputs validation place in Stack.validate

Because of outputs validation check located in
wrong place, outputs validation skipped, when
template has no resources. It's incorrect because
of possible incorrect references to unknown resources.

Change-Id: I693b51540b0678aa17b861b9f85a0cb2a9552660
Closes-bug: #1396441