Always fallback to default container cost
Always fallback to default container cost

In the case of a piggiebacking org, the :paid plan template doesn't
contain a :container_cost.  Use default-template-properties when a price
is not found, rather than just when a plan is not found (previously the
plan creation page for a piggiebacking org showed containers as not
having a cost.)

prathamesh-sonpatki/frontend,circleci/frontend,circleci/frontend,RayRutjes/frontend,RayRutjes/frontend,circleci/frontend,prathamesh-sonpatki/frontend