Incorrect parsing of a nested list inside an empty list item

[Andrew-Morozko]

Failing example

- 
  - foo

commonmark:

<ul>
<li>
<ul>
<li>foo</li>
</ul>
</li>
</ul>

goldmark:

<ul>
<li></li>
<li>foo</li>
</ul>

commonmark vs goldmark

This check seems to be the culprit