Missing field billing_event in the spec là gì

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Expected Behavior

To see what fields are required of me [when omitting content from spec].

Actual Behavior

$ oc apply -f no-task-pipeline.yaml
Error from server [BadRequest]: error when creating "no-task-pipeline.yaml": admission webhook "webhook.tekton.dev" denied the request: mutation failed: missing field[s]:

Steps to Reproduce the Problem

1. Apply an empty spec Pipeline to the OpenShift Pipelines Operator

Additional Info

• Kubernetes version: Output of kubectl version:

$ kubectl version
Client Version: version.Info{Major:"1", Minor:"15", GitVersion:"v1.15.3", GitCommit:"2d3c76f9091b6bec110a5e63777c332469e0cba2", GitTreeState:"clean", BuildDate:"2019-08-19T12:36:28Z", GoVersion:"go1.12.9", Compiler:"gc", Platform:"darwin/amd64"}
Server Version: version.Info{Major:"1", Minor:"17+", GitVersion:"v1.17.1", GitCommit:"f17a1cc", GitTreeState:"clean", BuildDate:"2020-03-15T08:08:33Z", GoVersion:"go1.13.4", Compiler:"gc", Platform:"linux/amd64"}

• Tekton Pipeline version: Output of tkn version or kubectl get pods -n tekton-pipelines -l app=tekton-pipelines-controller -o=jsonpath='{.items[0].metadata.labels.version}'

$ tkn version
Client version: 0.8.0
Pipeline version: unknown

The file I used:

$ cat no-task-pipeline.yaml
apiVersion: tekton.dev/v1alpha1
kind: Pipeline
metadata:
  name: no-task-pipeline
spec:

Also tried it in the OpenShift Console UI [with & without tasks:]