scripts/ceph/ceph_health.py: fix parsing when there is no message
scripts/ceph/ceph_health.py: fix parsing when there is no message

tcpcloud/monitoring-for-openstack,openstack/monitoring-for-openstack,padthaitofuhot/monitoring-for-openstack,tcpcloud/monitoring-for-openstack,stackforge/monitoring-for-openstack,magic0704/monitoring-for-openstack,padthaitofuhot/monitoring-for-openstack,openstack/monitoring-for-openstack,magic0704/monitoring-for-openstack,stackforge/monitoring-for-openstack