Describe the bug
On latest version (10.1.7) - registration forms are not fetched so users can't register.
This doesn't happen in earlier version (10.1.6).

To Reproduce
You can see it in https://inverse.chat/#converse/register (for example).
Type xmpp provider and click "Fetch registration form".
Also happens to me in my server.

Expected behavior
A registration form should be displayed.

Browser console shows:

panel.js:96 Uncaught TypeError: n._proto._reqToData is not a function
    at a_.getRegistrationFields (panel.js:96:34)
    at e._connect_cb (panel.js:80:29)
    at _o._onInitialMessage (websocket.js:270:24)
    at socket.onmessage (websocket.js:170:51)
getRegistrationFields	@	panel.js:96
e._connect_cb	@	panel.js:80