Added tests for empty nodes
Added tests for empty nodes


git-svn-id: https://svn.sable.mcgill.ca/mclab/Project@1629 89b902b4-d83f-0410-b942-89f7a419ffdb

Migrated from Sable/mclab@886ecbe1362be3f93e488e1876bb10f7dd6e9756

Sable/mclab-core,Sable/mclab-core,Sable/mclab-core,Sable/mclab-core,Sable/mclab-core,Sable/mclab-core,Sable/mclab-core,Sable/mclab-core