Changes: - null check on ratios calculation - Fix color bar formatting See: - https://code.usgs.gov/ghsc/nshmp/nshmp-apps/-/merge_requests/659 - https://code.usgs.gov/ghsc/nshmp/nshmp-lib-ng/-/tags/20.4.3 - https://code.usgs.gov/ghsc/nshmp/nshmp-utils-ts/-/tags/4.8.4