panic: `github.com/docker/scout-cli-plugin/internal/gha.getPreviousComments`

settings are (here for reference):

- name: Docker Scout
  uses: docker/scout-action@f8c776824083494ab0d56b8105ba2ca85c86e4de # v1.18.2
  with:
    command: cves,recommendations,compare
    image: archestra/platform:ci-test
    to: docker.io/archestra/platform:latest
    dockerhub-user: ${{ secrets.DOCKER_USERNAME }}
    dockerhub-password: ${{ secrets.DOCKER_PASSWORD }}
    ignore-unchanged: true
    only-severities: critical,high
    write-comment: true
    github-token: ${{ secrets.GITHUB_TOKEN }} # to be able to write the comment
    sarif-file: sarif.output.json

✓ SBOM of image already cached, 1522 packages indexed
      ...Pulling
      ✓ Pulled
      ...Storing image for indexing
      ✓ Image stored for indexing
      ...Indexing
      ✓ Indexed 1522 packages
      ✓ Provenance obtained from attestation
      ! Skipping policy evaluation due to missing organization
  panic: runtime error: invalid memory address or nil pointer dereference
  [signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x211cb18]
  
  goroutine 1 [running]:
  github.com/docker/scout-cli-plugin/internal/gha.getPreviousComments({0x3079350, 0xc000b187b0}, 0xc048d104d0, {0xc048cfe1f8, 0xc}, {0xc048cfe205, 0x9}, {0xc048d12280, 0x4b})
  	/home/runner/work/scout-cli-plugin/scout-cli-plugin/internal/gha/prcomment.go:165 +0x178
  github.com/docker/scout-cli-plugin/internal/gha.PostComment({0x3079350, 0xc000b187b0}, 0xc0009f0788, {0xc0000547d3, 0x7}, {0xc048cca000, 0xd5d})
  	/home/runner/work/scout-cli-plugin/scout-cli-plugin/internal/gha/prcomment.go:45 +0x3b6
  github.com/docker/scout-cli-plugin/internal/gha.Run({0x3079350, 0xc000b187b0}, 0xc0009f0788, {0xc0000547d3, 0x7}, 0xc0006f32f0, 0xc0003c48c0)
  	/home/runner/work/scout-cli-plugin/scout-cli-plugin/internal/gha/commands.go:134 +0x11c
  main.run()
  	/home/runner/work/scout-cli-plugin/scout-cli-plugin/cmd/github-action/main.go:83 +0x570
  main.main()
  	/home/runner/work/scout-cli-plugin/scout-cli-plugin/cmd/github-action/main.go:94 +0x13

Start at internal/gha/prcomment.go:165, where getPreviousComments panics, then trace the call from PostComment in the same file and the workflow entry points in commands.go and cmd/github-action/main.go. Reproduce the supplied Docker Scout configuration and ensure comment posting no longer panics for it.