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Fix 'kubectl cp' with no arguments causes a panic #65482
What this PR does / why we need it:
"kubectl cp" with no arguments causes a panic
Which issue(s) this PR fixes (optional, in
Special notes for your reviewer:
On Sun 1 Jul, 2018, 3:03 PM k8s-ci-robot, ***@***.***> wrote: @wgliang <https://github.com/wgliang>: The following test *failed*, say /retest to rerun them all: Test name Commit Details Rerun command pull-kubernetes-e2e-gce 630bbf1 <630bbf1> link <https://k8s-gubernator.appspot.com/build/kubernetes-jenkins/pr-logs/pull/65482/pull-kubernetes-e2e-gce/42796/> /test pull-kubernetes-e2e-gce Full PR test history <https://k8s-gubernator.appspot.com/pr/65482>. Your PR dashboard <https://k8s-gubernator.appspot.com/pr/wgliang>. Please help us cut down on flakes by linking to <https://git.k8s.io/community/contributors/devel/flaky-tests.md#filing-issues-for-flaky-tests> an open issue <https://github.com/kubernetes/kubernetes/issues?q=is:issue+is:open> when you hit one in your PR. Instructions for interacting with me using PR comments are available here <https://git.k8s.io/community/contributors/guide/pull-requests.md>. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra <https://github.com/kubernetes/test-infra/issues/new?title=Prow%20issue:> repository. I understand the commands that are listed here <https://go.k8s.io/bot-commands>. — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#65482 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/APXA0EwKWx5nZTDlkp4ENY-IVX0qb2rGks5uCJdbgaJpZM4U4Dgo> .
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