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e08aa72569
Running "docker nonexistent --version" printed the CLI version and
exited 0, so it couldn't be used to check whether a command or plugin
is available. Without "--version" the same invocation fails with an
"unknown command" error.
When no built-in command or plugin matches, runDocker falls through to
executing the root command, and cobra handles the "--version" flag
before the root command reports the unknown command. Unset the root
command's version in that fallback, so the standard unknown-command
error is returned.
A global "--version" flag ("docker --version nonexistent") is parsed
before the command name and still prints the version, as do
"docker --version" and "docker nonexistent --help".
Signed-off-by: Nimesh Kulkarni <167794819+GitNimay@users.noreply.github.com>