"opm alpha render-veneer semver" raise error when no "Candidate" in config yaml

"opm alpha render-veneer semver" raise error when no "Candidate" in config yaml

zhaoxia@xzha-mac semver % opm version
Version: version.Version{OpmVersion:"11644a543", GitCommit:"11644a5433442c33698d2eee8d3f865b0d9386c0", BuildDate:"2022-08-29T08:16:54Z", GoOs:"darwin", GoArch:"amd64"}

always

1. prepare catalog-semver-veneer-wrong.yaml 
zhaoxia@xzha-mac semver % cat catalog-semver-veneer-wrong.yaml 
Schema: olm.semver
GenerateMajorChannels: false
GenerateMinorChannels: true
Stable:
  Bundles:
  - Image: quay.io/olmqe/nginxolm-operator-bundle:v1.0.2
  - Image: quay.io/olmqe/nginxolm-operator-bundle:v2.1.0
Fast:
  Bundles:
  - Image: quay.io/olmqe/nginxolm-operator-bundle:v0.0.1
  - Image: quay.io/olmqe/nginxolm-operator-bundle:v2.0.1
  - Image: quay.io/olmqe/nginxolm-operator-bundle:v2.1.0 

2. run "opm alpha render-veneer semver"
zhaoxia@xzha-mac semver % opm alpha render-veneer semver catalog-semver-veneer-wrong.yaml
2022/08/29 16:48:56 semver "catalog-semver-veneer-wrong.yaml": semver-render: no bundles specified or no bundles could be rendered

3.

error "no bundles specified or no bundles could be rendered" is raised.

no error