Can't add virsh chassis

[Björn Tillenius]

This is with MAAS 2.7.0-8234-g.de2727f6c installed as a snap.

Going to the machine listing and choosing "Add Chassis", I fill in the following:

  Power Type: Virsh
  Power address: qemu+ssh://bjorn@192.168.100.1/system
  Password: *****

Clicking on "Save chassis" doesn't do anything. No websocket request is sent, and
I see this in the JS console:

ReferenceError: $ is not defined
    at c.t.saveChassis (maas.f8ca023….bundle.js:98)
    at fn (eval at compile (maas.f8ca023….bundle.js:26), <anonymous>:4:165)
    at i (maas.f8ca023….bundle.js:26)
    at c.$eval (maas.f8ca023….bundle.js:26)
    at c.$apply (maas.f8ca023….bundle.js:26)
    at HTMLButtonElement.<anonymous> (maas.f8ca023….bundle.js:26)
    at HTMLButtonElement.dispatch (maas.f8ca023….bundle.js:50)
    at HTMLButtonElement.m.handle (maas.f8ca023….bundle.js:50)
(anonymous) @ maas.f8ca023….bundle.js:26
(anonymous) @ maas.f8ca023….bundle.js:26
$apply @ maas.f8ca023….bundle.js:26
(anonymous) @ maas.f8ca023….bundle.js:26
dispatch @ maas.f8ca023….bundle.js:50
m.handle @ maas.f8ca023….bundle.js:50