Crash on usage

[DanTulovsky]

Describe the bug

% k view-webhook                                                                                                
W1002 10:10:34.102548   96545 warnings.go:67] admissionregistration.k8s.io/v1beta1 MutatingWebhookConfiguration is deprecated in v1.16+, unavailable in v1.22+; use admissionregistration.k8s.io/v1 MutatingWebhookConfiguration
W1002 10:10:34.162715   96545 warnings.go:67] admissionregistration.k8s.io/v1beta1 ValidatingWebhookConfiguration is deprecated in v1.16+, unavailable in v1.22+; use admissionregistration.k8s.io/v1 ValidatingWebhookConfiguration
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x18 pc=0x1e96c8a]

goroutine 1 [running]:
github.com/Trendyol/kubectl-view-webhook/pkg/k8s.retrieveValidDateCount(0x0, 0x0, 0x0, 0x0)
	/home/runner/work/kubectl-view-webhook/kubectl-view-webhook/pkg/k8s/webhook.go:257 +0x4a
github.com/Trendyol/kubectl-view-webhook/pkg/k8s.(*WebHookClient).fillMutatingWebhookConfigurations(0xc000353d60, 0x0, 0x0, 0x0, 0x0, 0xc00056cae0, 0x21, 0x0, 0x0, 0x0, ...)
	/home/runner/work/kubectl-view-webhook/kubectl-view-webhook/pkg/k8s/webhook.go:112 +0x2b3
github.com/Trendyol/kubectl-view-webhook/pkg/k8s.(*WebHookClient).Run(0xc000353d60, 0x2cf9798, 0x0, 0x0, 0xb, 0x2237d5a, 0x5)
	/home/runner/work/kubectl-view-webhook/kubectl-view-webhook/pkg/k8s/webhook.go:70 +0x208
github.com/Trendyol/kubectl-view-webhook/cmd.(*ViewWebhookOptions).Run(0xc0003e37a0, 0xc0003c7340, 0x2cf9798)
	/home/runner/work/kubectl-view-webhook/kubectl-view-webhook/cmd/root.go:139 +0xa5
github.com/Trendyol/kubectl-view-webhook/cmd.NewCmdViewWebhook.func1(0xc0003c7340, 0x2cf9798, 0x0, 0x0, 0x0, 0x0)
	/home/runner/work/kubectl-view-webhook/kubectl-view-webhook/cmd/root.go:70 +0x78
github.com/spf13/cobra.(*Command).execute(0xc0003c7340, 0xc00003a1d0, 0x0, 0x0, 0xc0003c7340, 0xc00003a1d0)
	/home/runner/go/pkg/mod/github.com/spf13/cobra@v1.1.1/command.go:850 +0x47c
github.com/spf13/cobra.(*Command).ExecuteC(0xc0003c7340, 0xc00000e010, 0x23d6aa0, 0xc00000e018)
	/home/runner/go/pkg/mod/github.com/spf13/cobra@v1.1.1/command.go:958 +0x375
github.com/spf13/cobra.(*Command).Execute(...)
	/home/runner/go/pkg/mod/github.com/spf13/cobra@v1.1.1/command.go:895
main.main()
	/home/runner/work/kubectl-view-webhook/kubectl-view-webhook/main.go:36 +0x167

% k version                                                                                                 
Client Version: version.Info{Major:"1", Minor:"21", GitVersion:"v1.21.2", GitCommit:"092fbfbf53427de67cac1e9fa54aaa09a28371d7", GitTreeState:"clean", BuildDate:"2021-06-16T12:59:11Z", GoVersion:"go1.16.5", Compiler:"gc", Platform:"darwin/amd64"}
Server Version: version.Info{Major:"1", Minor:"21", GitVersion:"v1.21.4-gke.1801", GitCommit:"589503e56a4fd76a38f277d6fb11bd6ec4931482", GitTreeState:"clean", BuildDate:"2021-09-14T03:52:38Z", GoVersion:"go1.16.6b7", Compiler:"gc", Platform:"linux/amd64"}

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[skaven81]

I'm getting the same thing...seems like this has been abandoned.