TypeError when using DNS over TLS

[piratecaveman]

When using dns type TLS, there is a TypeError and GreenTunnel falls back to use Cloudflare instead

Steps to reproduce the behavior:

1. Launch Green Tunnel with gt --dns-type tls --dns-server 8622a7.dns.nextdns.io -v "*"
2. See error:

   2021-07-14T04:45:49.348Z green-tunnel:dns TypeError [ERR_INVALID_ARG_TYPE]: The "string" argument must be of type string or an instance of Buffer or ArrayBuffer. Received undefined
   at new NodeError (node:internal/errors:363:5)
   at Function.byteLength (node:buffer:732:11)
   at Object.name.encodingLength (/home/wraith/.node_modules/lib/node_modules/green-tunnel/node_modules/dns-over-tls/node_modules/dns-packet/index.js:81:17)
   at Object.question.encodingLength (/home/wraith/.node_modules/lib/node_modules/green-tunnel/node_modules/dns-over-tls/node_modules/dns-packet/index.js:1433:15)
   at encodingLengthList (/home/wraith/.node_modules/lib/node_modules/green-tunnel/node_modules/dns-over-tls/node_modules/dns-packet/index.js:1523:52)
   at Object.exports.encodingLength (/home/wraith/.node_modules/lib/node_modules/green-tunnel/node_modules/dns-over-tls/node_modules/dns-packet/index.js:1491:5)
   at Object.exports.encode (/home/wraith/.node_modules/lib/node_modules/green-tunnel/node_modules/dns-over-tls/node_modules/dns-packet/index.js:1445:46)
   at Object.exports.streamEncode (/home/wraith/.node_modules/lib/node_modules/green-tunnel/node_modules/dns-over-tls/node_modules/dns-packet/index.js:1498:23)
   at /home/wraith/.node_modules/lib/node_modules/green-tunnel/node_modules/dns-over-tls/lib/dnstls.js:50:39
   at new Promise (<anonymous>)

Expected behavior No Errors should occur

Desktop (please complete the following information):

• OS: Arch Linux
• Browser: Microsoft Edge (Dev) [93.0.933.1], Firefox [90.0]
• Version: Rolling

Additional context Logs attached green.log