timeout when the Office-Online-Server is unreachable

[outnsp]

When the Nextcloud instance cannot reach the Office Online server, the entire Nextcloud instance no longer functions properly. Each click on the web interface results in long loading times or timeouts.

Suggestion for improvement: The Office Online app should check if the Office Online server is reachable. If the Office Online server is unreachable, the Office Online app should log a message in the app's backend and display it in the log. The functions of the Office Online app should remain deactivated until the Office Online server becomes reachable again.