Fix marshal of NodePath when nodes not fully initialized
Fix marshal of NodePath when nodes not fully initialized

Change-Id: Ib491ecfb22c904fa2a1632c2ba6c3df3c6942861

lebauce/skydive,redhat-cip/skydive,safchain/skydive,lebauce/skydive,safchain/skydive,skydive-project/skydive,safchain/skydive,lebauce/skydive,redhat-cip/skydive,safchain/skydive,skydive-project/skydive,lebauce/skydive,lebauce/skydive,lebauce/skydive,skydive-project/skydive,safchain/skydive,redhat-cip/skydive,lebauce/skydive,safchain/skydive,safchain/skydive,lebauce/skydive,skydive-project/skydive,safchain/skydive,skydive-project/skydive,skydive-project/skydive,skydive-project/skydive