pkg/manifests.list.AddInstance(): don't set Platform to an empty struct #1819
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If the Platform struct for an OCI instance being added to an image index is empty, set the Platform pointer field in the Descriptor struct to
nil
instead of setting it to point to a Platform struct filled with empty values. I expect this to be the case for at least some OCI artifacts being added to indexes.Likewise, if we're updating the Platform for an OCI instance and its value goes to zero, set its pointer to
nil
to avoid the same case.When reading information back from a descriptor, or setting a field in the Platform struct, don't assume that Platform is (already) set to a non-nil value.