fix: don't include recipients array if not necessary

package.json

@@ -1,6 +1,6 @@
 {
   "name": "stoat.js",
-  "version": "7.3.3",
+  "version": "7.3.4",
   "type": "module",
   "exports": {
     ".": "./lib/index.js"

src/classes/Channel.ts

@@ -802,11 +802,11 @@ export class Channel {
    * @param recipients Ring targets
    * @returns LiveKit URL and Token
    */
-  async joinCall(node?: string, forceDisconnect = true, recipients: (User | string)[] = []) {
+  async joinCall(node?: string, forceDisconnect = true, recipients?: (User | string)[]) {
     return await this.#collection.client.api.post(
       `/channels/${this.id as ''}/join_call`, {
       node,
-      recipients: recipients.map(entry => typeof entry === 'string' ? entry : entry.id),
+      recipients: recipients?.map(entry => typeof entry === 'string' ? entry : entry.id),
       force_disconnect: forceDisconnect
     });
   }