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Merge pull request #63460 from appscode/fix-admission

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Automatic merge from submit-queue. If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

Don't panic if admission options is nil

Since [1.10 release](https://github.com/kubernetes/apiserver/blob/release-1.10/pkg/server/options/recommended.go#L43) admission options are enabled by default . This was not the case in 1.9 release. Admission plugins seem unnecessary for a webhook server. This change is needed so that disabling admission options don't cause panic.

```release-note
NONE
```

@deads2k @sttts 

ref: https://github.com/openshift/generic-admission-server/pull/14
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Kubernetes Submit Queue 2018-05-07 06:35:14 -07:00 committed by GitHub
commit 52017b600b
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4
staging/src/k8s.io/apiserver/pkg/server/options/admission.go
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@ -87,6 +87,10 @@ func NewAdmissionOptions() *AdmissionOptions {
// AddFlags adds flags related to admission for a specific APIServer to the specified FlagSet
func (a *AdmissionOptions) AddFlags(fs *pflag.FlagSet) {
if a == nil {
return
}
fs.StringSliceVar(&a.EnablePlugins, "enable-admission-plugins", a.EnablePlugins, ""+
"admission plugins that should be enabled in addition to default enabled ones. "+
"Comma-delimited list of admission plugins: "+strings.Join(a.Plugins.Registered(), ", ")+". "+