2. Add check point when opening a node of tree, ignore the node whose id is null. git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@1463 6f19259b-4bc3-4df7-8a09-765794883524
2. Add check point when opening a node of tree, ignore the node whose id is null. git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@1463 6f19259b-4bc3-4df7-8a09-765794883524