fix panic: kubectl rollout undo

pkg/kubectl/cmd/rollout/rollout_pause.go

@@ -81,16 +81,8 @@ func NewCmdRolloutPause(f cmdutil.Factory, streams genericclioptions.IOStreams)
 		Long:    pause_long,
 		Example: pause_example,
 		Run: func(cmd *cobra.Command, args []string) {
-			allErrs := []error{}
-			err := o.Complete(f, cmd, args)
-			if err != nil {
-				allErrs = append(allErrs, err)
-			}
-			err = o.RunPause()
-			if err != nil {
-				allErrs = append(allErrs, err)
-			}
-			cmdutil.CheckErr(utilerrors.Flatten(utilerrors.NewAggregate(allErrs)))
+			cmdutil.CheckErr(o.Complete(f, cmd, args))
+			cmdutil.CheckErr(o.RunPause())
 		},
 		ValidArgs: validArgs,
 	}

pkg/kubectl/cmd/rollout/rollout_resume.go

@@ -84,16 +84,8 @@ func NewCmdRolloutResume(f cmdutil.Factory, streams genericclioptions.IOStreams)
 		Long:    resume_long,
 		Example: resume_example,
 		Run: func(cmd *cobra.Command, args []string) {
-			allErrs := []error{}
-			err := o.Complete(f, cmd, args)
-			if err != nil {
-				allErrs = append(allErrs, err)
-			}
-			err = o.RunResume()
-			if err != nil {
-				allErrs = append(allErrs, err)
-			}
-			cmdutil.CheckErr(utilerrors.Flatten(utilerrors.NewAggregate(allErrs)))
+			cmdutil.CheckErr(o.Complete(f, cmd, args))
+			cmdutil.CheckErr(o.RunResume())
 		},
 		ValidArgs: validArgs,
 	}

pkg/kubectl/cmd/rollout/rollout_undo.go

@@ -20,7 +20,6 @@ import (
 	"github.com/spf13/cobra"
 	"k8s.io/kubernetes/pkg/kubectl/polymorphichelpers"
 
-	utilerrors "k8s.io/apimachinery/pkg/util/errors"
 	"k8s.io/cli-runtime/pkg/genericclioptions"
 	"k8s.io/cli-runtime/pkg/genericclioptions/printers"
 	"k8s.io/cli-runtime/pkg/genericclioptions/resource"
@@ -84,16 +83,8 @@ func NewCmdRolloutUndo(f cmdutil.Factory, streams genericclioptions.IOStreams) *
 		Long:    undo_long,
 		Example: undo_example,
 		Run: func(cmd *cobra.Command, args []string) {
-			allErrs := []error{}
-			err := o.Complete(f, cmd, args)
-			if err != nil {
-				allErrs = append(allErrs, err)
-			}
-			err = o.RunUndo()
-			if err != nil {
-				allErrs = append(allErrs, err)
-			}
-			cmdutil.CheckErr(utilerrors.Flatten(utilerrors.NewAggregate(allErrs)))
+			cmdutil.CheckErr(o.Complete(f, cmd, args))
+			cmdutil.CheckErr(o.RunUndo())
 		},
 		ValidArgs: validArgs,
 	}