Use [] where a value is required
Use [] where a value is required

The use of .get() implies that having no value, or None is ok,
but in the case that's fixed here, a value of None would result
in an error, so [] is correct to use here.

Change-Id: I47113121c10c2d0682daf40eb616b379e2d212e8

ilay09/keystone,cernops/keystone,roopali8/keystone,jamielennox/keystone,vivekdhayaal/keystone,himanshu-setia/keystone,takeshineshiro/keystone,rajalokan/keystone,idjaw/keystone,dims/keystone,jonnary/keystone,ajayaa/keystone,roopali8/keystone,maestro-hybrid-cloud/keystone,dstanek/keystone,maestro-hybrid-cloud/keystone,takeshineshiro/keystone,mahak/keystone,klmitch/keystone,idjaw/keystone,ajayaa/keystone,jamielennox/keystone,mahak/keystone,cernops/keystone,ilay09/keystone,dstanek/keystone,openstack/keystone,dstanek/keystone,himanshu-setia/keystone,vivekdhayaal/keystone,jonnary/keystone,vivekdhayaal/keystone,openstack/keystone,mahak/keystone,rajalokan/keystone,openstack/keystone,klmitch/keystone,ilay09/keystone,rajalokan/keystone,dims/keystone