tree 68eff41452e468149bad6a350efd619b12dacf2b
parent d1a467fd6f3374ba0056b585c7f84c6366e6231f
author Jonathan Hart <jono@onlab.us> 1416877793 -0800
committer Jonathan Hart <jono@onlab.us> 1416877793 -0800

Null checking in packet-out mechanism.

If the switch has recently disconnected, we can get some NullPointerExceptions.

Change-Id: Ia5a854ed5cd6a933974c855e7297faa542626d9e