Asserted element exists before accessing it.
Asserted element exists before accessing it.

Review: https://reviews.apache.org/r/68819

abudnik/mesos,dforsyth/mesos,kaysoky/mesos,Gilbert88/mesos,reneploetz/mesos,reneploetz/mesos,Gilbert88/mesos,chhsia0/mesos,chhsia0/mesos,gsantovena/mesos,abudnik/mesos,abudnik/mesos,kaysoky/mesos,abudnik/mesos,reneploetz/mesos,gsantovena/mesos,jpeach/mesos,dforsyth/mesos,kaysoky/mesos,chhsia0/mesos,jpeach/mesos,reneploetz/mesos,gsantovena/mesos,jpeach/mesos,dforsyth/mesos,chhsia0/mesos,kaysoky/mesos,abudnik/mesos,kaysoky/mesos,gsantovena/mesos,chhsia0/mesos,Gilbert88/mesos,dforsyth/mesos,Gilbert88/mesos,reneploetz/mesos,Gilbert88/mesos,reneploetz/mesos,chhsia0/mesos,abudnik/mesos,kaysoky/mesos,gsantovena/mesos,Gilbert88/mesos,dforsyth/mesos,jpeach/mesos,jpeach/mesos,abudnik/mesos,dforsyth/mesos,jpeach/mesos,gsantovena/mesos,kaysoky/mesos,dforsyth/mesos,gsantovena/mesos,Gilbert88/mesos,chhsia0/mesos,jpeach/mesos,reneploetz/mesos