fix: do not fail when there are no changed files

[gowoons]

Closes #98

[github-actions]

Risk Level 2 - /home/runner/work/code-review-gpt/code-review-gpt/src/common/git/getFilesWithChanges.ts

The exit(0) command is used to terminate the process. This can be risky as it might terminate the process prematurely, especially if there are other operations that need to be completed. Consider throwing an error or returning a specific value to indicate that no files with changes were found, and handle this case in the calling function. For example:

if (fileNames.length === 0) {
  logger.warn(
    \"No files with changes found, you might need to stage your changes.\"
  );
  throw new Error('No files with changes found');
}

This way, the calling function can decide what to do when no files with changes are found.

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[github-actions]

Test results summary:

✅ [PASS] - Test case: Bad variable name
✅ [PASS] - Test case: Exposed secret
✅ [PASS] - Test case: Too many nested loops
✅ [PASS] - Test case: Unawaited Promise

SUMMARY: ✅ PASS: 4 - ⚠️ WARN: 0 - ❌ FAIL: 0

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