Adds identification of unknown sub-commands

Fixes knative#111 ``` ➜ ./kn service list unknown command "list" for "kn service" ➜ echo $? 1 ➜ ./kn revision list unknown command "list" for "kn revision" ➜ echo $? 1 ```
navidshaikh · May 15, 2019 · 8b44670 · 8b44670 · rhuss · Jun 9, 2019
1 parent 5e5b460
commit 8b44670
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diff --git a/pkg/kn/commands/revision.go b/pkg/kn/commands/revision.go
@@ -22,6 +22,8 @@ func NewRevisionCommand(p *KnParams) *cobra.Command {
 	revisionCmd := &cobra.Command{
 		Use:   "revision",
 		Short: "Revision command group",
+		Args:  cobra.NoArgs,
+		Run:   func(*cobra.Command, []string) {},
 	}
 	revisionCmd.AddCommand(NewRevisionGetCommand(p))
 	revisionCmd.AddCommand(NewRevisionDescribeCommand(p))

diff --git a/pkg/kn/commands/service.go b/pkg/kn/commands/service.go
@@ -22,6 +22,8 @@ func NewServiceCommand(p *KnParams) *cobra.Command {
 	serviceCmd := &cobra.Command{
 		Use:   "service",
 		Short: "Service command group",
+		Args:  cobra.NoArgs,
+		Run:   func(*cobra.Command, []string) {},
 	}
 	serviceCmd.AddCommand(NewServiceGetCommand(p))
 	serviceCmd.AddCommand(NewServiceDescribeCommand(p))