Merge pull request #1965 from bgth/patch-3

Fix one part of #1963. Missed Logic added.

Author: liquidpele

src/models/stackedAreaChart.js

@@ -402,7 +402,7 @@ nv.models.stackedAreaChart = function() {
 
             interactiveLayer.dispatch.on('elementMousemove', function(e) {
                 stacked.clearHighlights();
-                var singlePoint, pointIndex, pointXLocation, allData = [], valueSum = 0, allNullValues = true;
+                var singlePoint, pointIndex, pointXLocation, allData = [], valueSum = 0, allNullValues = true, atleastOnePoint = false;
                 data
                     .filter(function(series, i) {
                         series.seriesIndex = i;
@@ -414,6 +414,7 @@ nv.models.stackedAreaChart = function() {
                         var pointYValue = chart.y()(point, pointIndex);
                         if (pointYValue != null && pointYValue > 0) {
                             stacked.highlightPoint(i, pointIndex, true);
+                            atleastOnePoint = true;
                         }
 
                         // Draw at least one point if all values are zero.