hide the previous tooltip in case of null value (#2790)

bounteous · web-flow · commit 8422d2b708a6 · 2020-06-15T20:54:59.000+09:00
diff --git a/src/tooltip.js b/src/tooltip.js
@@ -270,6 +270,7 @@ ChartInternal.prototype.showTooltip = function(selectedData, element) {
     positionFunction =
       config.tooltip_position || ChartInternal.prototype.tooltipPosition
   if (dataToShow.length === 0 || !config.tooltip_show) {
+    $$.hideTooltip();
     return
   }
   $$.tooltip

Original file line number	Diff line number	Diff line change
`@@ -270,6 +270,7 @@ ChartInternal.prototype.showTooltip = function(selectedData, element) {`
`270`	`270`	`positionFunction =`
`271`	`271`	`config.tooltip_position \|\| ChartInternal.prototype.tooltipPosition`
`272`	`272`	`if (dataToShow.length === 0 \|\| !config.tooltip_show) {`
	`273`	`+ $$.hideTooltip();`
`273`	`274`	`return`
`274`	`275`	`}`
`275`	`276`	`$$.tooltip`