Allow for parsing table with only header (no body)

[davidcba1]

Describe the problem

When using an empty table like this

| Section/component | Name | Description | Comments |
|-------------------|------|-------------|----------|

I get this error

Exception occurred:
  File "/usr/local/lib/python3.9/site-packages/myst_parser/docutils_renderer.py", line 715, in render_table
    assert token.children and len(token.children) > 1
AssertionError

Removing the table or adding in dummy data works

Link to your repository or website

No response

Steps to reproduce

Running the build in a docker image and current versions of packages avail.

FROM sphinxdoc/sphinx:4.1.2

RUN python3 -m pip install sphinx_rtd_theme

RUN python3 -m pip install sphinxcontrib-confluencebuilder sphinx_git myst-parser

The version of Python you're using

No response

Your operating system

No response

Versions of your packages

No response

Additional context

No response

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[chrisjsewell]

Thanks, yeh this is legitimate Markdown, but I will have to double-check if it renders correctly via Sphinx