test_buildhtml.py: Wait for the subprocess to finish
commit0aed2b2b172d6fc5efe7af84fe2aff02e3e27052
authormilde <milde@929543f6-e4f2-0310-98a6-ba3bd3dd1d04>
Tue, 3 Mar 2020 20:53:38 +0000 (3 20:53 +0000)
committermilde <milde@929543f6-e4f2-0310-98a6-ba3bd3dd1d04>
Tue, 3 Mar 2020 20:53:38 +0000 (3 20:53 +0000)
treeb222a09fd523f7d08e17c0ffeae9a3a4cf833623
parente231c154757766620c0f9e28d78692cd249e9cd3
test_buildhtml.py: Wait for the subprocess to finish

To fix ResourceWarning: subprocess NNN is still running.

git-svn-id: http://svn.code.sf.net/p/docutils/code/trunk@8500 929543f6-e4f2-0310-98a6-ba3bd3dd1d04
docutils/tools/test/test_buildhtml.py