[Bug] fern add <generator> can unintentionally remove information

[dannysheridan]

Describe the bug

When I run the fern add <generator> command, it removes commented out code that I didn't intend for it to.

To reproduce

Start with the following generators.yml

api:
  path: openapi/openapi.json
groups:
  python-sdk:
    generators:
      - name: fernapi/fern-python-sdk
        version: 3.10.8
        # output:
        #   location: pypi
        #   package-name: "organization"
        #   token: ${PYPI_TOKEN}
        github:
          repository: fern-demo/organization-python-sdk

Then run fern add fern-typescript-node-sdk --group ts-sdk

Result:

api:
  path: openapi/openapi.json
groups:
  python-sdk:
    generators:
      - name: fernapi/fern-python-sdk
        version: 3.10.8
        github:
          repository: fern-demo/organization-python-sdk
  ts-sdk:
    generators:
      - name: fernapi/fern-typescript-node-sdk
        version: 0.39.3
        output:
          location: local-file-system
          path: ../sdks/typescript

Expected behavior

The command should only add information, it should not restructure or remove anything that already exists.

CLI Version

0.42.14