[go-nuts] stripping null in json string

[Seanchann Zhou]

hi:
   have json:

  "test": {
      "test1": null,
      "test2": null,
      "test3": null,
      "test4": null,
      "proto": "dhcp",
      "test5": null
    }


   how to safety stripping null field from above json. thanks

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