Group chat icons not working

[kicken]

Describe the bug
The icons next to group chats are not working properly.

To Reproduce
Steps to reproduce the behavior:

1. Join a group chat
2. Click the details icon

Expected behavior
Details popup should open

Actual behavior
Error is received in the console and no popup is displayed.

Uncaught TypeError: model is undefined
    __WEBPACK_DEFAULT_EXPORT__ muc-details.js:17
    toHTML muc-details.js:19
    render view.js:79
    initialize base.js:28
    initialize muc-details.js:11
    View view.js:45
    child helpers.js:32
    child helpers.js:32
    create api.js:46
    show api.js:26
    showRoomDetailsModal view.js:61
    showRoomDetailsModal view.js:51
    handleEvent lit-html.js:1383
muc-details.js:17:14

Environment (please complete the following information):

• Converse.js version: latest master (f1734db)