dotcloud/docker — pull request #5143 by kzys (2014-04-10 13:08:37+00:00)
Title: Avoid "invalid memory address or nil pointer dereference" panic

libcontainer.GetNamespace returns nil on FreeBSD because
libcontainer.namespaceList is empty. In this case, Namespaces#Get should
return nil instead of being panic.

Docker-DCO-1.1-Signed-off-by: Kato Kazuyoshi (github: kzys)