Yong Tang a2afbcbb57 Fix failure in docker ps --format when .Label has args
This fix tries to fix the issue in 30279 where  `docker ps --format`
fails if `.Label` has args. For example:
```
docker ps --format '{{.ID}}\t{{.Names}}\t{{.Label "some.label"}}'
```

The reason for the failure is that during the preprocessing phase
to detect the existance of `.Size`, the `listOptionsProcessor`
does not has a method of `Label(name string) string`.

This results in the failure of
```
template: :1:24: executing "" at <.Label>: Label is not a method but has arguments
```

This fix fixes the issue by adding needed method of `Label(name string) string`.

This fix fixes 30279.

Signed-off-by: Yong Tang <yong.tang.github@outlook.com>
2017-01-23 09:31:48 -08:00
2017-01-03 15:58:41 -05:00
2016-08-25 13:09:04 -04:00
2016-07-05 20:42:17 +08:00
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