Fix message parsing when link or lifecycle state is None
Fix message parsing when link or lifecycle state is None

Change-Id: Ibd826ca4b2ddf2c1ae586b1168cbe642a1028609

openstack/monasca-persister,openstack/monasca-persister,stackforge/monasca-persister,sapcc/monasca-persister,openstack/monasca-persister,stackforge/monasca-persister,stackforge/monasca-persister