The apiserver crash when I delete crd

**Is this a BUG REPORT or FEATURE REQUEST?**:

> /kind bug

**What happened**:

The apiserver crash when I delete crd.

**What you expected to happen**:

The apiserver should correctly valiate crd when I create a crd with validation field.

**How to reproduce it (as minimally and precisely as possible)**:

test.yaml

```yaml
apiVersion: apiextensions.k8s.io/v1beta1
kind: CustomResourceDefinition
metadata:
  name: tests.example.com
spec:
  group: example.com
  names:
    kind: Test
    listKind: TestList
    plural: tests
  scope: Namespaced
  version: v1
  validation:
    openAPIV3Schema:
      type: "object"
      properties:
        spec:
          $ref: "#/definitions/zeta"
```

1. create crd

```shell
kubectl create -f test.yaml
```

2. delete crd

```shell
kubectl delete  -f test.yaml
```

**Anything else we need to know?**:

the logs of apiserver

```
I0118 03:26:56.117246       1 cache.go:32] Waiting for caches to sync for autoregister controller
E0118 03:26:56.120677       1 customresource_handler.go:283] object has no key "zeta"
E0118 03:26:56.120771       1 runtime.go:66] Observed a panic: "invalid memory address or nil pointer dereference" (runtime error: invalid memory address or nil pointer dereference)
/go/src/k8s.io/kubernetes/_output/dockerized/go/src/k8s.io/kubernetes/vendor/k8s.io/apimachinery/pkg/util/runtime/runtime.go:72
/go/src/k8s.io/kubernetes/_output/dockerized/go/src/k8s.io/kubernetes/vendor/k8s.io/apimachinery/pkg/util/runtime/runtime.go:65
/go/src/k8s.io/kubernetes/_output/dockerized/go/src/k8s.io/kubernetes/vendor/k8s.io/apimachinery/pkg/util/runtime/runtime.go:51
/usr/local/go/src/runtime/asm_amd64.s:509
/usr/local/go/src/runtime/panic.go:491
/usr/local/go/src/runtime/panic.go:63
/usr/local/go/src/runtime/signal_unix.go:367
/go/src/k8s.io/kubernetes/_output/dockerized/go/src/k8s.io/kubernetes/vendor/k8s.io/apiextensions-apiserver/pkg/apiserver/customresource_handler.go:285
/go/src/k8s.io/kubernetes/_output/dockerized/go/src/k8s.io/kubernetes/vendor/k8s.io/apiextensions-apiserver/pkg/controller/finalizer/crd_finalizer.go:158
/go/src/k8s.io/kubernetes/_output/dockerized/go/src/k8s.io/kubernetes/vendor/k8s.io/apiextensions-apiserver/pkg/controller/finalizer/crd_finalizer.go:126
/go/src/k8s.io/kubernetes/_output/dockerized/go/src/k8s.io/kubernetes/vendor/k8s.io/apiextensions-apiserver/pkg/controller/finalizer/crd_finalizer.go:90
/go/src/k8s.io/kubernetes/_output/dockerized/go/src/k8s.io/kubernetes/vendor/k8s.io/apiextensions-apiserver/pkg/controller/finalizer/crd_finalizer.go:269
/go/src/k8s.io/kubernetes/_output/dockerized/go/src/k8s.io/kubernetes/vendor/k8s.io/apiextensions-apiserver/pkg/controller/finalizer/crd_finalizer.go:257
/go/src/k8s.io/kubernetes/_output/dockerized/go/src/k8s.io/kubernetes/vendor/k8s.io/apiextensions-apiserver/pkg/controller/finalizer/crd_finalizer.go:250
/go/src/k8s.io/kubernetes/_output/dockerized/go/src/k8s.io/kubernetes/vendor/k8s.io/apimachinery/pkg/util/wait/wait.go:133
/go/src/k8s.io/kubernetes/_output/dockerized/go/src/k8s.io/kubernetes/vendor/k8s.io/apimachinery/pkg/util/wait/wait.go:134
/go/src/k8s.io/kubernetes/_output/dockerized/go/src/k8s.io/kubernetes/vendor/k8s.io/apimachinery/pkg/util/wait/wait.go:88
/usr/local/go/src/runtime/asm_amd64.s:2337
panic: runtime error: invalid memory address or nil pointer dereference [recovered]
	panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x10 pc=0x2a1bcc9]
goroutine 2235 [running]:
k8s.io/kubernetes/vendor/k8s.io/apimachinery/pkg/util/runtime.HandleCrash(0x0, 0x0, 0x0)
	/go/src/k8s.io/kubernetes/_output/dockerized/go/src/k8s.io/kubernetes/vendor/k8s.io/apimachinery/pkg/util/runtime/runtime.go:58 +0x111
panic(0x3339cc0, 0x8f2b500)
	/usr/local/go/src/runtime/panic.go:491 +0x283
k8s.io/kubernetes/vendor/k8s.io/apiextensions-apiserver/pkg/apiserver.(*crdHandler).GetCustomResourceListerCollectionDeleter(0xc42028d100, 0xc4251a9680, 0xc4201228f0, 0xc42bc65978)
	/go/src/k8s.io/kubernetes/_output/dockerized/go/src/k8s.io/kubernetes/vendor/k8s.io/apiextensions-apiserver/pkg/apiserver/customresource_handler.go:285 +0x49
k8s.io/kubernetes/vendor/k8s.io/apiextensions-apiserver/pkg/controller/finalizer.(*CRDFinalizer).deleteInstances(0xc42089d720, 0xc4251a9680, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, ...)
	/go/src/k8s.io/kubernetes/_output/dockerized/go/src/k8s.io/kubernetes/vendor/k8s.io/apiextensions-apiserver/pkg/controller/finalizer/crd_finalizer.go:158 +0x87
k8s.io/kubernetes/vendor/k8s.io/apiextensions-apiserver/pkg/controller/finalizer.(*CRDFinalizer).sync(0xc42089d720, 0xc424d244a0, 0x11, 0xc42b258de0, 0x0)
	/go/src/k8s.io/kubernetes/_output/dockerized/go/src/k8s.io/kubernetes/vendor/k8s.io/apiextensions-apiserver/pkg/controller/finalizer/crd_finalizer.go:126 +0x2cb
k8s.io/kubernetes/vendor/k8s.io/apiextensions-apiserver/pkg/controller/finalizer.(*CRDFinalizer).(k8s.io/kubernetes/vendor/k8s.io/apiextensions-apiserver/pkg/controller/finalizer.sync)-fm(0xc424d244a0, 0x11, 0xc420a9a640, 0x30c6320)
	/go/src/k8s.io/kubernetes/_output/dockerized/go/src/k8s.io/kubernetes/vendor/k8s.io/apiextensions-apiserver/pkg/controller/finalizer/crd_finalizer.go:90 +0x3e
k8s.io/kubernetes/vendor/k8s.io/apiextensions-apiserver/pkg/controller/finalizer.(*CRDFinalizer).processNextWorkItem(0xc42089d720, 0x956200)
	/go/src/k8s.io/kubernetes/_output/dockerized/go/src/k8s.io/kubernetes/vendor/k8s.io/apiextensions-apiserver/pkg/controller/finalizer/crd_finalizer.go:269 +0xd4
k8s.io/kubernetes/vendor/k8s.io/apiextensions-apiserver/pkg/controller/finalizer.(*CRDFinalizer).runWorker(0xc42089d720)
	/go/src/k8s.io/kubernetes/_output/dockerized/go/src/k8s.io/kubernetes/vendor/k8s.io/apiextensions-apiserver/pkg/controller/finalizer/crd_finalizer.go:257 +0x2b
k8s.io/kubernetes/vendor/k8s.io/apiextensions-apiserver/pkg/controller/finalizer.(*CRDFinalizer).(k8s.io/kubernetes/vendor/k8s.io/apiextensions-apiserver/pkg/controller/finalizer.runWorker)-fm()
	/go/src/k8s.io/kubernetes/_output/dockerized/go/src/k8s.io/kubernetes/vendor/k8s.io/apiextensions-apiserver/pkg/controller/finalizer/crd_finalizer.go:250 +0x2a
k8s.io/kubernetes/vendor/k8s.io/apimachinery/pkg/util/wait.JitterUntil.func1(0xc42562adc0)
	/go/src/k8s.io/kubernetes/_output/dockerized/go/src/k8s.io/kubernetes/vendor/k8s.io/apimachinery/pkg/util/wait/wait.go:133 +0x5e
k8s.io/kubernetes/vendor/k8s.io/apimachinery/pkg/util/wait.JitterUntil(0xc42562adc0, 0x3b9aca00, 0x0, 0x1, 0xc420055500)
	/go/src/k8s.io/kubernetes/_output/dockerized/go/src/k8s.io/kubernetes/vendor/k8s.io/apimachinery/pkg/util/wait/wait.go:134 +0xbd
k8s.io/kubernetes/vendor/k8s.io/apimachinery/pkg/util/wait.Until(0xc42562adc0, 0x3b9aca00, 0xc420055500)
	/go/src/k8s.io/kubernetes/_output/dockerized/go/src/k8s.io/kubernetes/vendor/k8s.io/apimachinery/pkg/util/wait/wait.go:88 +0x4d
created by k8s.io/kubernetes/vendor/k8s.io/apiextensions-apiserver/pkg/controller/finalizer.(*CRDFinalizer).Run
	/go/src/k8s.io/kubernetes/_output/dockerized/go/src/k8s.io/kubernetes/vendor/k8s.io/apiextensions-apiserver/pkg/controller/finalizer/crd_finalizer.go:250 +0x193

```

**Environment**:
- Kubernetes version (use `kubectl version`):

```
Client Version: version.Info{Major:"1", Minor:"9", GitVersion:"v1.9.1", GitCommit:"3a1c9449a956b6026f075fa3134ff92f7d55f812", GitTreeState:"clean", BuildDate:"2018-01-04T11:52:23Z", GoVersion:"go1.9.2", Compiler:"gc", Platform:"linux/amd64"}
Server Version: version.Info{Major:"1", Minor:"9", GitVersion:"v1.9.1", GitCommit:"3a1c9449a956b6026f075fa3134ff92f7d55f812", GitTreeState:"clean", BuildDate:"2018-01-04T11:40:06Z", GoVersion:"go1.9.2", Compiler:"gc", Platform:"linux/amd64"}
```
- OS (e.g. from /etc/os-release):

```
NAME="CentOS Linux"
VERSION="7 (Core)"
ID="centos"
ID_LIKE="rhel fedora"
VERSION_ID="7"
PRETTY_NAME="CentOS Linux 7 (Core)"
ANSI_COLOR="0;31"
CPE_NAME="cpe:/o:centos:centos:7"
HOME_URL="https://www.centos.org/"
BUG_REPORT_URL="https://bugs.centos.org/"

CENTOS_MANTISBT_PROJECT="CentOS-7"
CENTOS_MANTISBT_PROJECT_VERSION="7"
REDHAT_SUPPORT_PRODUCT="centos"
REDHAT_SUPPORT_PRODUCT_VERSION="7"
```
- Kernel (e.g. `uname -a`):

```
Linux 10-144-91-87 3.10.0-514.21.1.el7.x86_64 #1 SMP Thu May 25 17:04:51 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux
```
- Install tools:

kubeadm


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The apiserver crash when I delete crd #58427

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