Avoid exception when unclosed directive container is found within another container and chunkDocument is empty (fixes #16, fixes micromark/micromark#173).

[DavidAnson]

Initial checklist

• [x] I read the support docs
• [x] I read the contributing guide
• [x] I agree to follow the code of conduct
• [x] I searched issues and couldn’t find anything (or linked relevant results below)
• [x] If applicable, I’ve added docs and tests

Description of changes

Avoid exception when unclosed directive container is found within another container and chunkDocument is empty (fixes #16, fixes micromark/micromark#173).

I tried for a while to parse the scenario successfully, but couldn't find a way to avoid creating an empty container that didn't break one of the existing "lazy" tests. As it is already an edge-case scenario, giving up like this seems okay to me - definitely better than crashing callers. :)

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 100.00%. Comparing base (7f23ba8) to head (b85e704). Report is 8 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #27 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 9 9 Lines 1416 1365 -51 ========================================= - Hits 1416 1365 -51 ```

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[github-actions[bot]]

Hi! This was closed. Team: If this was merged, please describe when this is likely to be released. Otherwise, please add one of the no/* labels.

[wooorm]

Thanks for working on this!

I appreciate that errors are not nice. Still, I believe that we must strive towards correctness. You’re silencing an error, and introducing an incorrect result.

I spent some time with the code and introduced a proper fix.

[wooorm]

Released in 3.0.2!

[DavidAnson]

Love it, thank you!