Wait before sending status code 200 for the first top call and if that
fails return a proper error code.
This was leading to some confusion in [1] because podman just reported
200 but did not wirte anything back.
[1] https://bugzilla.redhat.com/show_bug.cgi?id=2215572
Signed-off-by: Paul Holzinger <pholzing@redhat.com>