opts: FilterOpt: show empty string if no values are set
follow-up to f81816ef88
We could decide to not initialize a default, and do this only when
setting a value, but this may require more changes, so doing this
as a starting-point.
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
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@ -13,7 +13,7 @@ List images
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| `-a`, `--all` | `bool` | | Show all images (default hides intermediate images) |
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| [`--digests`](#digests) | `bool` | | Show digests |
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| [`-f`](#filter), [`--filter`](#filter) | `filter` | `{}` | Filter output based on conditions provided |
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| [`-f`](#filter), [`--filter`](#filter) | `filter` | | Filter output based on conditions provided |
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| [`--format`](#format) | `string` | | Format output using a custom template:<br>'table': Print output in table format with column headers (default)<br>'table TEMPLATE': Print output in table format using the given Go template<br>'json': Print in JSON format<br>'TEMPLATE': Print output using the given Go template.<br>Refer to https://docs.docker.com/go/formatting/ for more information about formatting output with templates |
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| [`--no-trunc`](#no-trunc) | `bool` | | Don't truncate output |
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| `-q`, `--quiet` | `bool` | | Only show image IDs |
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