[stable20] Fix dashboard rendering if accessibility app is disabled

[backportbot-nextcloud]

⚠️ This backport had conflicts and is incomplete ⚠️

backport of #23179

[rullzer]

/compile amend /

[madmax2012]

For me the dashboard has still not been rendering properly after upgrading to 20.0.1.

[BloodyIron]

Yeah I just upgraded to v20.0.1 and the dashboard is broken the same still. This was the very reason I upgraded :/

[jancborchardt]

@madmax2012 @BloodyIron is it the same issue as #23163 ? If so please comment with further logs and info there so we can reopen, otherwise open a new issue with the relevant error / console logs. Thanks! :)

[monolied]

I have the same issue after updating from 19.0.3 to 20.0.2. The dashboard is entirely white with my avatar picture in the top right the only visible item and exception. The avatar is usable and, while invisible, the app icons are present, complete and usable, too. Also invisible, but usable, is the Nextcloud icon in the top left. The complete area below these shows no sign of hidden usability.

During a reload, nothing pops up in nextcloud.log. Web server is nginx, OS is Debian 10.6 fully upgraded. Dashboard is listed as version 7.0.0.

(sudo -u www-data php) occ app:enable accessibility fixes the issue, but with disabling it goes back to whiteout. Both happens without needing to reboot, restart or logout/login, just a reload of the dashboard page is required to see the effect.

[juliusknorr]

Could you check if it continues to be an issue after clearing your browser cache?

[monolied]

Yes, still an issue. I also tried several browsers and computers. Kinda surprised that not everyone seems to be able to easily reproduce it, actually, since it seems so robust and reliable.

[juliusknorr]

Please check if there is an error in the browser console and if it is actually the same or a different one as in #23163 (comment)

[monolied]

From the description I'd say it is the same error. However, I seem to have a different error message in the console (and it looks rather tellltale):

TypeError: window.OCA.Accessibility is undefined
    h getBackgroundUrl.js:27
    backgroundImage App.vue:149
    VueJS 3
    backgroundStyle App.vue:156
    VueJS 3
    M App.vue:1
    VueJS 6
    <anonymous> main.js:21
    Webpack 3
vue.runtime.esm.js:1888:12
Failed to register panel in the frontend as no backend data was provided for weather App.vue:211
Failed to register panel in the frontend as no backend data was provided for calendar App.vue:268
Failed to register panel in the frontend as no backend data was provided for calendar App.vue:268
Failed to register panel in the frontend as no backend data was provided for recommendations App.vue:268
Failed to register panel in the frontend as no backend data was provided for calendar App.vue:268
Failed to register panel in the frontend as no backend data was provided for recommendations App.vue:268
Failed to register panel in the frontend as no backend data was provided for weather App.vue:211
Failed to register panel in the frontend as no backend data was provided for status App.vue:211