Latest Headscale Beta API breaks Headscale-UI

[Leen15]

** Supporting Details **
Provide the following:

• Browser Version: Google Chrome
• Headscale Version: 0.18-beta1
• Any Browser Errors (control+shift+i in chrome to see)

Uncaught (in promise) TypeError: Cannot read properties of undefined (reading 'length')
    at Object.p (_page.svelte-8213986a.js:1:15519)
    at Ot (index-4a5d41f3.js:4:1456)
    at ft (index-4a5d41f3.js:4:1142)

Describe the bug
If I try to open a Device with the dropdown button or just pressing on the row, I get a console error and the UI stops working. Only a refresh can make the UI working again.

[routerino]

Known issue, the API isn't set in stone and thus upstream changes can break the API. Once headscale 18 leaves beta I'll put in a lock-step patch.