Merge branch 'do-not-highlight-nil-metric' into 'main'

fix non-existing metrics being highlighted on hover

See merge request chartwerk/line-pod!25

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@chartwerk/line-pod",
-  "version": "0.6.5",
+  "version": "0.6.6",
   "description": "Chartwerk line chart",
   "main": "dist/index.js",
   "scripts": {

src/index.ts

@@ -290,14 +290,13 @@ export class LinePod extends ChartwerkPod<LineTimeSerie, LineOptions> {
     let points = []; // datapoints in each metric that is closest to xValue/yValue position
     this.series.visibleSeries.forEach((serie: LineTimeSerie) => {
       const closestDatapoint = this.getClosestDatapoint(serie, xValue, yValue);
-      if(closestDatapoint === undefined) {
+      if(_.isNil(closestDatapoint) || _.isNil(closestDatapoint[0])) {
         this.hideCrosshairCircle(serie.idx);
-        return;
-      }
-
+      } else {
         const xPosition = this.state.xScale(closestDatapoint[0]);
         const yPosition = this.state.yScale(closestDatapoint[1]);
         this.moveCrosshairCircle(xPosition, yPosition, serie.idx);
+      }
 
       points.push({
         value: closestDatapoint,