tree 14659a42523423998a226d5bf4d48d56437668ec
parent 4abfe99c6f60d54827b9d22bf5fb1cac5a2ece23
author Matt Rosencrantz <mattr@google.com> 1464900383 -0700
committer Matt Rosencrantz <mattr@google.com> 1464907531 +0000

flow manager: Don't attempt to close nil listeners.

This can happen if we fail to listen and we've already shut down the
flow manager.

Change-Id: I6558198a92d55aab182c75337cc4cff94236cdc2