tree dd46cb94a777da2bd085cb7abb160236a6a792a1
parent 5b9f7725c14c1fb8c6d5e691efc7d7921b40958f
author Stephen Li <stephenli@google.com> 1495566514 -0700
committer Stephen Li <stephenli@google.com> 1495566941 -0700

Set topic before we try to use it if it is empty.

Change-Id: I47e1ada1667466f0987af2ff15b07e1bf8e3fec6