do not show duration for builds that never started
do not show duration for builds that never started

[fixes #80873832]

pivotal-devin-fallak/atc,savaki/atc,savaki/atc,simonjjones/atc,simonjjones/atc,utako/atc,pivotal-devin-fallak/atc,zachgersh/atc,utako/atc,zachgersh/atc,savaki/atc,simonjjones/atc,utako/atc,zachgersh/atc,zachgersh/atc,pivotal-devin-fallak/atc