Tooltip: Fix issue with tooltip throwing an error when retrieving values (grafana#20565)

Author: dprokop

packages/grafana-ui/src/components/Graph/Graph.tsx

@@ -139,7 +139,6 @@ export class Graph extends PureComponent<GraphProps, GraphState> {
 
     // Check if tooltip needs to be rendered with custom tooltip component, otherwise default to GraphTooltip
     const tooltipContentRenderer = tooltipElementProps.tooltipComponent || GraphTooltip;
-
     // Indicates column(field) index in y-axis dimension
     const seriesIndex = activeItem ? activeItem.series.seriesIndex : 0;
     // Indicates row index in active field values
@@ -272,7 +271,11 @@ export class Graph extends PureComponent<GraphProps, GraphState> {
     };
 
     try {
-      $.plot(this.element, series, flotOptions);
+      $.plot(
+        this.element,
+        series.filter(s => s.isVisible),
+        flotOptions
+      );
     } catch (err) {
       console.log('Graph rendering error', err, flotOptions, series);
       throw new Error('Error rendering panel');

packages/grafana-ui/src/components/Graph/GraphWithLegend.tsx

@@ -94,7 +94,7 @@ export const GraphWithLegend: React.FunctionComponent<GraphWithLegendProps> = (p
     <div className={wrapper}>
       <div className={graphContainer}>
         <Graph
-          series={series.filter(s => !!s.isVisible)}
+          series={series}
           timeRange={timeRange}
           timeZone={timeZone}
           showLines={showLines}