Conflict Scan: fails if label is already removed

[david-allison]

Workflow file: https://github.com/ankidroid/Anki-Android/blob/main/.github/workflows/conflict.yaml

Relevant log

PR #17443 is unstable
PR #17443 is mergeable
Removing 'Has Conflicts' label from PR #17443
RequestError [HttpError]: Label does not exist
    at /home/runner/work/_actions/actions/github-script/v7/dist/index.js:9537:21
    at process.processTicksAndRejections (node:internal/process/task_queues:95:5)
    at async removeLabel (eval at callAsyncFunction (/home/runner/work/_actions/actions/github-script/v7/dist/index.js:35424:16), <anonymous>:31:5)
    at async checkPullRequests (eval at callAsyncFunction (/home/runner/work/_actions/actions/github-script/v7/dist/index.js:35424:16), <anonymous>:88:25) {
  status: 404,
  response: {
    url: 'https://api.github.com/repos/ankidroid/Anki-Android/issues/17443/labels/Has%20Conflicts',
    status: 404,
    headers: {
      'access-control-allow-origin': '*',
      'access-control-expose-headers': 'ETag, Link, Location, Retry-After, X-GitHub-OTP, X-RateLimit-Limit, X-RateLimit-Remaining, X-RateLimit-Used, X-RateLimit-Resource, X-RateLimit-Reset, X-OAuth-Scopes, X-Accepted-OAuth-Scopes, X-Poll-Interval, X-GitHub-Media-Type, X-GitHub-SSO, X-GitHub-Request-Id, Deprecation, Sunset',
      'content-encoding': 'gzip',
      'content-security-policy': "default-src 'none'",
      'content-type': 'application/json; charset=utf-8',
      date: 'Wed, 04 Dec 2024 15:57:22 GMT',
      'referrer-policy': 'origin-when-cross-origin, strict-origin-when-cross-origin',
      server: 'github.com',
      'strict-transport-security': 'max-age=31536000; includeSubdomains; preload',
      'transfer-encoding': 'chunked',
      vary: 'Accept-Encoding, Accept, X-Requested-With',
      'x-accepted-github-permissions': 'issues=write; pull_requests=write',
      'x-content-type-options': 'nosniff',
      'x-frame-options': 'deny',
Error: Unhandled error: HttpError: Label does not exist
      'x-github-api-version-selected': '2022-11-28',
      'x-github-media-type': 'github.v3; format=json',
      'x-github-request-id': 'C009:194EDA:B6F65D:16A336D:67507BE1',
      'x-ratelimit-limit': '5000',
      'x-ratelimit-remaining': '4862',
      'x-ratelimit-reset': '[173](https://github.com/ankidroid/Anki-Android/actions/runs/12163504786/job/33922865806?pr=17443#step:2:174)3330283',
      'x-ratelimit-resource': 'core',
      'x-ratelimit-used': '138',
      'x-xss-protection': '0'
    },
    data: {
      message: 'Label does not exist',
      documentation_url: 'https://docs.github.com/rest/issues/labels#remove-a-label-from-an-issue',
      status: '404'
    }
  },
  request: {
    method: 'DELETE',
    url: 'https://api.github.com/repos/ankidroid/Anki-Android/issues/[174](https://github.com/ankidroid/Anki-Android/actions/runs/12163504786/job/33922865806?pr=17443#step:2:175)43/labels/Has%20Conflicts',
    headers: {
      accept: 'application/vnd.github.v3+json',
      'user-agent': 'actions/github-script octokit-core.js/5.0.1 Node.js/20.18.0 (linux; x64)',
      authorization: 'token [REDACTED]'
    },
    request: {
      agent: [Agent],
      fetch: [Function: proxyFetch],
      hook: [Function: bound bound register]
    }
  }
}

https://github.com/ankidroid/Anki-Android/actions/runs/12163504786/job/33922865806?pr=17443

---

Endpoint docs: https://docs.github.com/en/rest/issues/labels?apiVersion=2022-11-28#remove-a-label-from-an-issue

This endpoint returns a 404 Not Found status if the label does not exist.

Note: "does not exist" could mean to me that the label does not exist on the PR (expected), or the label does not exist at all (catastrophic error)

I suspect it's the former, and we should handle this by ignoring the error and continuing

• Raised Remove a label from an issue: Clarify 404 status code github/docs#35553 for clarification