// if no confidence interval is available, see if this schedule
// is 100% complete. If so, draw a vertical line on the chart.
Date completionDate = tl.getTaskRoot().getActualDate();
if (completionDate != null
&& maybeAddSeries(new SingleValueConfidenceInterval(
completionDate.getTime()), seriesName))
continue;
// if no interval is available and we're less than 100% complete,
// see if they have a forecast date, and draw that as a single