collect support bundle without subcommand

Author: divolgin

cmd/troubleshoot/cli/root.go

@@ -15,6 +15,7 @@ import (
 func RootCmd() *cobra.Command {
 	cmd := &cobra.Command{
 		Use:   "troubleshoot [url]",
+		Args:  cobra.MinimumNArgs(1),
 		Short: "Generate and manage support bundles",
 		Long: `A support bundle is an archive of files, output, metrics and state
 from a server that can be used to assist when troubleshooting a server.`,