How can I join a session as a subscriber without publishing

Using openvidu-browser 2.30 I am splitting the code of this example from its repository, so that it works with one editor and many subscribers, but it only works if all the users connecting are publishers and subscribers at the same time.

The code I am using for subscribers is the same as in app.js, but eliminating these two lines so that it does not publish the video

var publisher = OV.initPublisher(“publisher”);

The publisher code is the same as that in app.js

Please, what would I be missing to make that openvidu-browser example work in the form of 1 publisher and many subscribers?