cli/command/context: allow context show to print context, even on error

This allows the user to still see what context is _set_ in cases where it
does not exist;

    docker context show
    nosuchcontext
    load context "nosuchcontext": context does not exist: open /root/.docker/contexts/meta/8bfef2a74c7d06add4bf4c73b0af97d9f79c76fe151ae0e18b9d7e57104c149b/meta.json: no such file or directory

The error is printed on stderr, so can be redirected:

    docker context show 2> /dev/null
    nosuchcontext

    echo $?
    1

This can help in cases where the context is used to (e.g.) set the command-prompt,
but the user removed the context. With this change, the context name can still be
shown, but commands that _require_ the context will still fail.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

Author: thaJeztah

cli/command/context/show.go

@@ -25,10 +25,10 @@ func newShowCommand(dockerCli command.Cli) *cobra.Command {
 
 func runShow(dockerCli command.Cli) error {
 	context := dockerCli.CurrentContext()
-	metadata, err := dockerCli.ContextStore().GetMetadata(context)
+	fmt.Fprintln(dockerCli.Out(), context)
+	_, err := dockerCli.ContextStore().GetMetadata(context)
 	if err != nil {
 		return err
 	}
-	fmt.Fprintln(dockerCli.Out(), metadata.Name)
 	return nil
 }