JSON output: descriptor name is missing "grype" value

[anubhav06]

What happened:
The descriptor.name has an empty value in the JSON output.

 "descriptor": {
  "name": "",

What you expected to happen:
This was not the case before. I had grype v0.64.2 and in that version grype used to list descriptor.name as "grype". However, when I updated to the latest version (v0.69.1), we get this bug.

How to reproduce it (as minimally and precisely as possible):

grype $IMAGE -o json --file grype.json

check the descriptor block output

Environment:

• Output of grype version: 0.69.1
• OS (e.g: cat /etc/os-release or similar): Ubuntu 20.04.4 LTS