Or else we can violate array range boundaries in: out = strings.Split(out, ":")[1] and get runtime error. We got this runtime error when run TestRunPortFromDockerRangeInUse Somehow docker goes silently if it cannot publish port because of no bridge. Signed-off-by: Pavel Tikhomirov <ptikhomirov@parallels.com> Upstream-commit: cad770f992ee5837273a02edb28f73624898bee1 Component: engine