Address comments

Author: minggangw

lib/node.js

@@ -862,8 +862,8 @@ class Node extends rclnodejs.ShadowNode {
       throw new TypeError('Invalid argument');
     }
     if (publisher.events) {
-      publisher.events.forEach((handler) => {
-        this._destroyEntity(handler, this._events);
+      publisher.events.forEach((event) => {
+        this._destroyEntity(event, this._events);
       });
       publisher.events = [];
     }
@@ -880,8 +880,8 @@ class Node extends rclnodejs.ShadowNode {
       throw new TypeError('Invalid argument');
     }
     if (subscription.events) {
-      subscription.events.forEach((handler) => {
-        this._destroyEntity(handler, this._events);
+      subscription.events.forEach((event) => {
+        this._destroyEntity(event, this._events);
       });
       subscription.events = [];
     }

lib/publisher.js

@@ -116,9 +116,6 @@ class Publisher extends Entity {
    * @returns {Array} The array of event handlers for this publisher.
    */
   get events() {
-    if (!this._events) {
-      throw new Error('Event handlers are not set for this publisher.');
-    }
     return this._events;
   }
 
@@ -127,9 +124,6 @@ class Publisher extends Entity {
    * @param {Array} events - The array of event handlers to be set for this publisher.
    */
   set events(events) {
-    if (this._events) {
-      throw new Error('Event handlers are already set for this publisher.');
-    }
     this._events = events;
   }
 }