core: Not Responding Treatment is broken

NPE on VdsNotRespondingTreatmentCommand prevents hosts from rebooting automatically
using power-management.

Change-Id: I3871bd414509324d4178ea633ca4d7f9aae74ebf
Bug-Url: https://bugzilla.redhat.com/1079702
Signed-off-by: lzelkha@redhat.com <lzelkha@redhat.com>