bug in omitempty fields in output

[ehsandeep]

Nuclei version:

latest/dev

Current Behavior:

reference and matched-line added as null in json output

{
  "template": "http/technologies/tech-detect.yaml",
  "template-url": "https://github.com/projectdiscovery/nuclei-templates/blob/main/http/technologies/tech-detect.yaml",
  "template-id": "tech-detect",
  "template-path": "/Users/geekboy/nuclei-templates/http/technologies/tech-detect.yaml",
  "info": {
    "name": "Wappalyzer Technology Detection",
    "author": [
      "hakluke"
    ],
    "tags": [
      "tech"
    ],
    "reference": null,
    "severity": "info",
    "metadata": {
      "max-request": 1
    }
  },
  "matcher-name": "cloudflare",
  "type": "http",
  "host": "https://nuclei.sh",
  "matched-at": "https://nuclei.sh",
  "ip": "172.66.43.44",
  "timestamp": "2023-06-30T15:53:55.805352+05:30",
  "curl-command": "curl -X 'GET' -d '' -H 'Accept: */*' -H 'Accept-Language: en' -H 'User-Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2919.83 Safari/537.36' 'https://nuclei.sh'",
  "matcher-status": true,
  "matched-line": null
}

Expected Behavior:

Similar to the description and other optional fields, the output should exclude fields with no data.

{
  "template": "http/technologies/tech-detect.yaml",
  "template-url": "https://github.com/projectdiscovery/nuclei-templates/blob/main/http/technologies/tech-detect.yaml",
  "template-id": "tech-detect",
  "template-path": "/Users/geekboy/nuclei-templates/http/technologies/tech-detect.yaml",
  "info": {
    "name": "Wappalyzer Technology Detection",
    "author": [
      "hakluke"
    ],
    "tags": [
      "tech"
    ],
    "severity": "info",
    "metadata": {
      "max-request": 1
    }
  },
  "matcher-name": "cloudflare",
  "type": "http",
  "host": "https://nuclei.sh",
  "matched-at": "https://nuclei.sh",
  "ip": "172.66.43.44",
  "timestamp": "2023-06-30T15:53:55.805352+05:30",
  "curl-command": "curl -X 'GET' -d '' -H 'Accept: */*' -H 'Accept-Language: en' -H 'User-Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2919.83 Safari/537.36' 'https://nuclei.sh'",
  "matcher-status": true,
}

Steps To Reproduce:

echo nuclei.sh | nuclei -id tech-detect -j | jq .

[kchason]

I can look into this one, both fields are marked as ignore-empty but I'll do some troubleshooting