asc_getDisplayEmpty return displayEmptyCellsAs or default if not exist

cell/model/WorkbookElems.js

@@ -4835,7 +4835,7 @@ CellArea.prototype = {
 		return this.lineWeight;
 	};
 	sparklineGroup.prototype.asc_getDisplayEmpty = function () {
-		return this.displayEmptyCellsAs;
+		return null !== this.displayEmptyCellsAs ? this.displayEmptyCellsAs : Asc.c_oAscEDispBlanksAs.Zero;
 	};
 	sparklineGroup.prototype.asc_getMarkersPoint = function () {
 		return this.markers;

common/Charts/DrawingObjects.js

@@ -662,11 +662,7 @@ CSparklineView.prototype.initFromSparkline = function(oSparkline, oSparklineGrou
         chart_space.displayHidden = oSparklineGroup.displayHidden;
         chart_space.displayEmptyCellsAs = oSparklineGroup.displayEmptyCellsAs;
 
-        var nDisplayEmptyCellsAs = AscFormat.isRealNumber(oSparklineGroup.displayEmptyCellsAs) ? oSparklineGroup.displayEmptyCellsAs : Asc.c_oAscEDispBlanksAs.Zero;
-
-        if(AscFormat.isRealNumber(nDisplayEmptyCellsAs))
-        {
-            switch(oSparklineGroup.displayEmptyCellsAs)
+        switch(oSparklineGroup.asc_getDisplayEmpty())
         {
             case Asc.c_oAscEDispBlanksAs.Span:
             {
@@ -684,7 +680,6 @@ CSparklineView.prototype.initFromSparkline = function(oSparkline, oSparklineGrou
                 break;
             }
         }
-        }
         chart_space.displayHidden = oSparklineGroup.displayHidden;
         settings.putTitle(c_oAscChartTitleShowSettings.none);
         settings.putHorAxisLabel(c_oAscChartTitleShowSettings.none);