Fix logic for whether to show readviz in the case where het readviz is available, but hom readviz is missing for all individuals (or vice versa)
Fix logic for whether to show readviz in the case where het readviz is available, but hom readviz is missing for all individuals (or vice versa)

konradjk/exac_browser,konradjk/exac_browser,macarthur-lab/gnomad_browser,macarthur-lab/gnomad_browser,macarthur-lab/gnomad_browser,macarthur-lab/gnomad_browser,konradjk/exac_browser,macarthur-lab/gnomad_browser