Updated openstack/openstack
Project: openstack/heat  73f7d6886abb80dce492bb13f0e6662099f4ec61
null
Don't provide default values to properties.get()

The properties of a resource are known, so we don't need to provide
default values to properties.get().

Change-Id: I2c28d9fe41db589a885c458dba35780aabed87c0