fixed deleting nodes in a node group
fixed deleting nodes in a node group

NMGRL/pychron,USGSDenverPychron/pychron,UManPychron/pychron,NMGRL/pychron,UManPychron/pychron,USGSDenverPychron/pychron,UManPychron/pychron,NMGRL/pychron,NMGRL/pychron,UManPychron/pychron,USGSDenverPychron/pychron,USGSDenverPychron/pychron