message: Event annotation should have min width
diff: @@ -683,8 +683,8 @@ function nvd3Vis(slice, payload) {
  x: d => Math.min(xScale(new Date(d[e.timeColumn])),
  xScale(new Date(d[e.intervalEndColumn]))),
  y: 0,
  - width: d => Math.abs(xScale(new Date(d[e.intervalEndColumn])) -
  - xScale(new Date(d[e.timeColumn]))),
  + width: d => Math.max(Math.abs(xScale(new Date(d[e.intervalEndColumn])) -
  + xScale(new Date(d[e.timeColumn]))), 1),
  height: annotationHeight,
  })
  .attr('class', `${e.opacity} ${e.style}`)
  