
It can be that zuul_site_mirror_fqdn env variable will not be set, in this case the whole job will fail, instead of simply not configuring mirrors during image build. With this patch, if set_fact fails, mirrors simply will not be configured during image build, as planned in lines 62 and 88 in this playbook Change-Id: I049c696c7fb0d7cadb527a9f17dd01a42a671baa