Unsafe null destructuring in auth credentials

[Anshumancanrock]

Description:

When users aren't authenticated, API methods in EmbeddedChatApi.ts send the literal string "undefined" in auth headers instead of empty values. This happens because of unsafe destructuring: (await this.auth.getCurrentUser()) || {} returns an empty object when the user is null, causing userId and authToken to be undefined.

Steps to reproduce:

1. Call any API method when user is not logged in
2. Check the HTTP request headers
3. See X-Auth-Token: "undefined" and X-User-Id: "undefined" (literal strings)

Expected behavior:

Auth headers should contain empty strings "" when user is not authenticated, not the literal string "undefined".

Actual behavior:

37 API methods send "undefined" as header values due to the unsafe pattern || {}. Headers.set() converts JavaScript undefined to the string "undefined".