tree 7d17fe056e5a6ed472be00c4a25ba86039a822aa
parent a0caabfa2443efdff8ef87e6db0186b68133cea5
author Gary Morain <gmorain@chromium.org> 1336066106 -0700
committer Gerrit <chrome-bot@google.com> 1336168784 -0700

shill: Allow null callback in OnScanReply

The current implemtation of Cellular::Scan calls
CellularCapability::Scan with a null callback.
CellularCapabilityUniversal::OnScanReply now checks for null before
trying to run the callback.

BUG=None
TEST=manual.  Invoke a scan on a E362 modem and observe that the scan
compeltes without shill crashing.  Also added unittest.

Change-Id: I368d6b30e8b482c01015af6214546bd108daa796
Reviewed-on: https://gerrit.chromium.org/gerrit/21777
Commit-Ready: Gary Morain <gmorain@chromium.org>
Reviewed-by: Gary Morain <gmorain@chromium.org>
Tested-by: Gary Morain <gmorain@chromium.org>