fix serialize restart spec with null string

Signed-off-by: realityone <realityone@me.com>
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realityone 2016-10-14 18:20:55 +08:00
commit 22d91f60be
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@ -12,3 +12,6 @@ services:
on-failure-5:
image: busybox
restart: "on-failure:5"
restart-null:
image: busybox
restart: ""