Add error check when looking up public key info for a managed key within PKI (#14639)
Add error check when looking up public key info for a managed key within PKI (#14639)

* Add error check when looking up public key info for a managed key within PKI

* Trap use case that an unknown public key is returned to PKI through managed keys
hashicorp/vault,rnaveiras/vault,rnaveiras/vault,hashicorp/vault,rnaveiras/vault,rnaveiras/vault,rnaveiras/vault,hashicorp/vault,hashicorp/vault,hashicorp/vault,hashicorp/vault