perl lib: create empty nodes
perl lib: create empty nodes

wgerlach/Shock,teharrison/Shock,MG-RAST/Shock,teharrison/Shock,MG-RAST/Shock,wgerlach/Shock,MG-RAST/Shock,wgerlach/Shock,wgerlach/Shock,MG-RAST/Shock,teharrison/Shock,teharrison/Shock,wgerlach/Shock,MG-RAST/Shock,teharrison/Shock,teharrison/Shock