message: Fix broken Y axis values when all traffic values are zero
  avoid drawing traffic when traffic datapoints are zero
diff: @@ -16,13 +16,24 @@ type Props = {
  duration: DurationInSeconds;
  };
  +function showMetrics(metrics: Metric[] | undefined): boolean {
  + // show metrics if metrics exists and some values at least are not zero
  + if (metrics && metrics.length > 0 && metrics[0].datapoints.some(dp => Number(dp[1]) !== 0)) {
  + return true;
  + }
  +
  + return false;
  +}
  +
  class OverviewCardSparkline extends React.Component<Props, {}> {
  render() {
  - if (this.props.metrics && this.props.metrics.length > 0) {
  + if (showMetrics(this.props.metrics)) {
  let series: VCLine<RichDataPoint>[] = [];
  + if (this.props.metrics && this.props.metrics.length > 0) {
  const data = toVCLine(this.props.metrics[0].datapoints, 'Total', PFColors.Blue400);
  series.push(data);
  + }
  if (this.props.errorMetrics && this.props.errorMetrics.length > 0) {
  const dataErrors = toVCLine(this.props.errorMetrics[0].datapoints, '4xx+5xx', PFColors.Danger);
  