message: Fix box_plot NaN issue
  fixes
diff: @@ -296,9 +296,7 @@ function nvd3Vis(slice, payload) {
  case 'box_plot':
  colorKey = 'label';
  chart = nv.models.boxPlotChart();
  - chart.x(function (d) {
  - return d.label;
  - });
  + chart.x(d => d.label);
  chart.staggerLabels(true);
  chart.maxBoxWidth(75); // prevent boxes from being incredibly wide
  break;
  @@ -353,7 +351,8 @@ function nvd3Vis(slice, payload) {
  chart.x2Axis.tickFormat(xAxisFormatter);
  height += 30;
  }
  - if (vizType !== 'dist_bar' && chart.xAxis && chart.xAxis.tickFormat) {
  + const isXAxisString = ['dist_bar', 'box_plot'].includes(vizType) >= 0;
  + if (!isXAxisString && chart.xAxis && chart.xAxis.tickFormat) {
  chart.xAxis.tickFormat(xAxisFormatter);
  }
  