There were two different behaviours during template validation and creation
stack (with template validation). In first case error was raised if
template did not have any resources. However user could create stack
without error using this such kind of template.
This patch make behaviour equal for both variant and gives ability to
create and successfully validate stack with template which does not have
resources.
Change-Id: I4dc30ccdc45e0fa7ff678b434106e056dba5f3b4
Closes-Bug: #1278090
d102b1ee1c