If the empty variable happens to be sorted to the end of the list then TrimSpace() would remove it. Instead only strip the single trailing newline. Signed-off-by: Daniel Nephin <dnephin@docker.com> (cherry picked from commit fff605c3b3557acf6bf793813d695fba59d7fa21) Signed-off-by: Eli Uriegas <eli.uriegas@docker.com>