fixed extraction line manager to handle invalid valve name/description
fixed extraction line manager to handle invalid valve name/description

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