feat: add checks and debug for sem-release

[OmarIthawi]

This is mostly an attempt to make the process a bit more robust:

• add one more debug message
• ensure the NEXT_VERSION is not empty before proceeding to release

This PR doesn't address the root cause which broke the the first release https://github.com/openedx/openedx-atlas/actions/runs/5786749334/attempts/1 with a 404 error

RequestError [HttpError]: Not Found
    at /home/runner/.npm/_npx/d32d92066bae6c10/node_modules/@octokit/request/dist-node/index.js:112:21
    at process.processTicksAndRejections (node:internal/process/task_queues:95:5)
    at async requestWithGraphqlErrorHandling (/home/runner/.npm/_npx/d32d92066bae6c10/node_modules/@octokit/plugin-retry/dist-node/index.js:71:20)
    at async Job.doExecute (/home/runner/.npm/_npx/d32d92066bae6c10/node_modules/bottleneck/light.js:405:18) {
  status: 404,
  response: {
    url: 'https://api.github.com/repos/openedx/openedx-atlas/releases',
    status: 404,

Testing

• Test on my fork: https://github.com/Zeit-Labs/openedx-atlas/releases/tag/v1.1.0

---

This contribution is part of the FC-0012 project which is sparked by the Translation Infrastructure update OEP-58.

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[github-actions]

🎉 This PR is included in version 0.3.0 🎉

The release is available on GitHub release

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