See owncloud/enterprise#1955

See
https://sentry.io/owncloud/desktop-win-and-mac/issues/243433178/activity/
https://sentry.io/owncloud/desktop-win-and-mac/issues/234182688/activity/

The problem was that an account's QNetworkAccessManager can be deleted
when reentering the event loop.

The problem was that split("", SkipEmptyParts) is the empty list.

See
https://sentry.io/owncloud/desktop-win-and-mac/issues/251167186/

On my OS X, it might get hidden under other apps while I opened it and then want to quickly
verify something in another app.

Newer servers will have the option of hiding version, versionstring, edition
and productname. They will always send the full information in the capabilities.

Issue #3936