Ken ICHIKAWA 8e8f727f50 Fix since time exit display when s.FinishedAt is zero
When s.FinishedAt is zero, the since time exit in docker ps doesn't display correct time.
For example
```
Exited (0) 292.471209 years ago
```
This patch fixes the since time exit to display nothing if s.FinishedAt is zero.

Docker-DCO-1.1-Signed-off-by: Ken ICHIKAWA <ichikawa.ken@jp.fujitsu.com> (github: ichik1)
Upstream-commit: 4002eac8b8b4007de03e78dbd57232fac583d05b
Component: engine
2014-03-21 15:28:02 +09:00
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