Updated openstack/openstack
Project: openstack/heat  d7e91a1bc39019c1212de5eead24b0af380e71ec

Doc: don't generate empty properties fields

Don't create empty properties fields in the resources samples.

This patch will help resolve niceness gates failures when generating the
docbook HOT reference.

Change-Id: I3c74fa583ac55dc0a23520ec07f5d07e3d1b6fab
Closes-Bug: #1360558