fix(frontend): fix toasts not appearing on errors

Since in the refactoring in c05c83af the `message` is not defined anymore if a generic error occurs but only the `correlationId`,
the toast didn't show up, as the toast was defined to only be visible when the `message` is defined.
Now the toast appears either if the `message` or the `correlationId` is visible.

Signed-off-by: martinfrancois <f.martin@fastmail.com>