Keyguard: don't try to fetch the badgeIcon if remoteClientPackage == null

Logcat shows....if client is lost there is no need to force an exception due that remoteClientPackage
in this case is null.

Change-Id: I80e612610f93c9d70c854b2fcb8fbf0c0d8f9e2a
Merge "Keyguard: don't try to fetch the badgeIcon if remoteClientPackage == null" into pac-4.4