LIMS-2156: Ignore blank index values when calculating ReferenceAnalysesGroupID
LIMS-2156: Ignore blank index values when calculating ReferenceAnalysesGroupID

veroc/Bika-LIMS,rockfruit/bika.lims,labsanmartin/Bika-LIMS,rockfruit/bika.lims,labsanmartin/Bika-LIMS,veroc/Bika-LIMS,veroc/Bika-LIMS,labsanmartin/Bika-LIMS