message: [nvd3] fix single metric showing up in legend
diff: @@ -884,9 +884,15 @@ class NVD3TimeSeriesViz(NVD3Viz):
  if df[name].dtype.kind not in "biufc":
  continue
  series_title = name
  + if (
  + isinstance(series_title, (list, tuple)) and
  + len(series_title) > 1 and
  + len(self.metrics) == 1):
  + # Removing metric from series name if only one metric
  + series_title = series_title[1:]
  if isinstance(series_title, string_types):
  series_title += title_suffix
  - elif title_suffix and isinstance(series_title, list):
  + elif title_suffix and isinstance(series_title, (list, tuple)):
  series_title.append(title_suffix)
  d = {
  