Merge remote-tracking branch 'upstream/fix_440' into convert-to-es-cl…

…asses

* upstream/fix_440:
  Fix RobotWebTools#440, correctly delete old grid
  Add missing semi-colon
  Update Build
  Bump rollup from 2.56.3 to 2.57.0 (RobotWebTools#443)
  Bump mocha from 9.1.1 to 9.1.2 (RobotWebTools#442)
  Bump @rollup/plugin-node-resolve from 13.0.4 to 13.0.5 (RobotWebTools#441)

src/navigation/OccupancyGridClient.js

@@ -77,11 +77,13 @@ export class OccupancyGridClient extends EventEmitter2 {
     // check for an old map
     if (this.currentGrid) {
       // check if it there is a tf client
-      if (this.currentGrid.tfClient) {
+      if (this.tfClient) {
         // grid is of type ROS3D.SceneNode
-        this.currentGrid.unsubscribeTf();
+        this.sceneNode.unsubscribeTf();
+        this.sceneNode.remove(this.currentGrid);
+      } else {
+        this.rootObject.remove(this.currentGrid);
       }
-      this.sceneNode.remove(this.currentGrid);
       this.currentGrid.dispose();
     }