clean up Jenks classifications when there is little variation in the heatmap the classification can contain multiple zeros
clean up Jenks classifications
when there is little variation in the heatmap the classification can contain multiple zeros

horak/Japan-Digital-Archive,jcuanm/Japan-Digital-Archive,horak/Japan-Digital-Archive,jcuanm/Japan-Digital-Archive,rchen152/Japan-Digital-Archive,jcuanm/Japan-Digital-Archive,rchen152/Japan-Digital-Archive,jcuanm/Japan-Digital-Archive,rchen152/Japan-Digital-Archive,horak/Japan-Digital-Archive,horak/Japan-Digital-Archive,jcuanm/Japan-Digital-Archive,rchen152/Japan-Digital-Archive,horak/Japan-Digital-Archive,rchen152/Japan-Digital-Archive,horak/Japan-Digital-Archive,rchen152/Japan-Digital-Archive,rchen152/Japan-Digital-Archive,horak/Japan-Digital-Archive,jcuanm/Japan-Digital-Archive,jcuanm/Japan-Digital-Archive