Spacing bugs with docutils 0.17 and toctree

[agjohnson]

Still digging into which is the correct bug, but noticed competing bad spacing on two versions.

On QA builds[1], I get no indentation at all:

1: https://readthedocs-static-dev.s3.us-east-2.amazonaws.com/qa/theme/sphinx4-theme1-html4/index.html#

On local build of tox -e py3-sphinx18-html4, I a spacing regression that we've seen before:

I'm guessing the latter is the most accurate bug, I can't explain why the QA tests have such a clearly busted toc tree listing.

[agjohnson]

I believe this is actually two bugs. The first bug is because toctree-wrapper can be outside a section on html4 output. This is triggered because the QA docs didn't find the included README.rst file and so no section was started before the toctree. This explains why the issue is only visible there and not on local tests. Confirmed this is the problem, the output now looks like my local test.

The second bug is the regression, we had this issue with spacing on 0.4.3. The issue is not present on 0.5.2:

[agjohnson]

Also noticing the spacing issue on html5 output (sphinx41, theme 1.0alpha1):