message: Boxplot should not require a datetime column
  See
diff: @@ -853,7 +853,7 @@ class BoxPlotViz(NVD3Viz):
  viz_type = 'box_plot'
  verbose_name = _('Box Plot')
  sort_series = False
  - is_timeseries = True
  + is_timeseries = False
  def to_series(self, df, classed='', title_suffix=''):
  label_sep = ' - '
  