event handlers short circuit if client closes
event handlers short circuit if client closes

[#82261444]

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