Small fix so that median_vaf_purity doesn't error out when analyzing a cohort where only a subset of the patients have variants (or, some actually have zero variants).
Coverage decreased (-0.1%) to 53.157% when pulling 735b0aff15be45909223156d261b5f3ddf0a0baa on median-vaf-missing into c00291a06a3d60d6492c7af799135cc5003ffa42 on master.
Small fix so that
median_vaf_purity
doesn't error out when analyzing a cohort where only a subset of the patients have variants (or, some actually have zero variants).