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We have seen a panic when re-joining a node to a swarm cluster. The cause of the issue is unknown, so we just need to add a test for nil objects and log when we get the condition. Hopefully this can prevent the crash and we can recover the config at a later time. Signed-off-by: Stephen J Day <stephen.day@docker.com> Upstream-commit: 454128c6e82cded211c1412e3eb350b1f7533ee2 Component: engine