Make plan metadata optional
Make plan metadata optional

[#73901254]
Signed-off-by: Ben Calegari <9a58dcb4629f0f5a554e5de501c7fc8e7b1788bc@pivotal.io>

cloudfoundry/cf-mysql-release,cloudfoundry/cf-mysql-release,cloudfoundry/cf-mysql-release,cloudfoundry/cf-mysql-release