fixed bug with group variable when not all samples are used
fixed bug with group variable when not all samples are used

kbase/KBaseRNASeq,kbaseIncubator/KBaseRNASeq,kbase/KBaseRNASeq,kbase/KBaseRNASeq,kbaseIncubator/KBaseRNASeq,kbaseIncubator/KBaseRNASeq,kbase/KBaseRNASeq