fix relaod variant json on add dataset
fix relaod variant json on add dataset

macarthur-lab/seqr,macarthur-lab/xbrowse,ssadedin/seqr,macarthur-lab/seqr,ssadedin/seqr,macarthur-lab/seqr,macarthur-lab/xbrowse,macarthur-lab/xbrowse,macarthur-lab/seqr,macarthur-lab/seqr,ssadedin/seqr,macarthur-lab/xbrowse,macarthur-lab/xbrowse,ssadedin/seqr,macarthur-lab/xbrowse,ssadedin/seqr