Modifications to getFieldVisitMeasurementsShifts() to omit shifts where:
Modifications to getFieldVisitMeasurementsShifts() to omit shifts where:

the minimum or maxium shift value is missing.
USGS-R/repgen,zmoore-usgs/repgen,mhines-usgs/repgen,thongsav-usgs/repgen,lindsaycarr/repgen,zmoore-usgs/repgen,USGS-R/repgen,lindsaycarr/repgen,zmoore-usgs/repgen,dpattermann-usgs/repgen,mhines-usgs/repgen,USGS-R/repgen,thongsav-usgs/repgen,thongsav-usgs/repgen,dpattermann-usgs/repgen,dpattermann-usgs/repgen,lindsaycarr/repgen,mhines-usgs/repgen