Go에서 JSON을 언마샬링할 때 빈 값과 누락된 값을 어떻게 구별할 수 있나요?

import (
    "encoding/json"
    "fmt"
)

type Category struct {
    Name        string
    Description string
}

var categories []Category

jsonBlob := []byte(`[
    {"Name": "A", "Description": "Monotremata"},
    {"Name": "B"},
    {"Name": "C", "Description": ""}
]`)

err := json.Unmarshal(jsonBlob, &categories)
if err != nil {
    fmt.Println("error:", err)
}
fmt.Printf("%+v", categories)

[{Name:A Description:Monotremata} {Name:B Description:} {Name:C Description:}]

type Category struct {
    Name        string
    Description *string
}

[{Name:A Description:0x1050c150} {Name:B Description:<nil>} {Name:C Description:0x1050c158}]