Ensuring slider step is non negative.
This closes
// update the slider min/max/step values
var step = (maxMillis - minMillis) / config.sliderTickCount;
- slider.slider('option', 'min', minMillis).slider('option', 'max', maxMillis).slider('option', 'step', step).slider('value', maxMillis);
+ slider.slider('option', 'min', minMillis).slider('option', 'max', maxMillis).slider('option', 'step', step > 0 ? step : 1).slider('value', maxMillis);
// populate the event timeline
$('#event-time').text(formatEventTime(maxMillis, provenanceTableCtrl));
