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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@ -7,7 +7,7 @@ Remove all stopped containers
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| Name | Type | Default | Description |
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|:----------------------|:---------|:--------|:-------------------------------------------------|
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| [`--filter`](#filter) | `filter` | `{}` | Provide filter values (e.g. `until=<timestamp>`) |
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| [`--filter`](#filter) | `filter` | | Provide filter values (e.g. `until=<timestamp>`) |
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| `-f`, `--force` | `bool` | | Do not prompt for confirmation |
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