Fix for deserialize cereal exception

This commit provides a fix for an issue in which the cereal
deserialize() would crash the phosphor-host-state-manager,
incase persistence file is empty in restore path.

Change-Id: I5f7774166b5a719fa035b2a2cd4f041303a1e6bf
Signed-off-by: Jayanth Othayoth <ojayanth@in.ibm.com>
1 file changed