[PATCH v2 01/23] docs/qapidoc: support header-less freeform sections

[John Snow]

The code as written can't handle if a header isn't found and will crash,
because `node` will be uninitialized. If we don't have a section title,
create a generic block to insert text into instead.

(This patch also removes a lingering pylint warning in the QAPIDoc
implementation that prevents getting a clean baseline to use for
forthcoming additions.)

I am not attempting to *fully* clean up the existing QAPIDoc
implementation in pylint because I intend to delete it anyway; this
patch merely accomplishes a baseline under a specific pylint
configuration:

PYTHONPATH=../../scripts/ pylint --disable=fixme,too-many-lines,\
consider-using-f-string,missing-docstring,unused-argument,\
too-many-arguments,too-many-positional-arguments,\
too-many-public-methods \
qapidoc.py

(under at least pylint 3.3.1; more robust tamping down of the
environment needed to consistently perform checks will happen later -
hopefully soon, sorry for the inconvenience.)

This at least ensures there aren't regressions outside of these general
warnings in the new qapidoc.py code to be committed.

Signed-off-by: John Snow <jsnow@redhat.com>
---
 docs/sphinx/qapidoc.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/docs/sphinx/qapidoc.py b/docs/sphinx/qapidoc.py
index 5f96b46270b..5a4d7388b29 100644
--- a/docs/sphinx/qapidoc.py
+++ b/docs/sphinx/qapidoc.py
@@ -421,6 +421,8 @@ def freeform(self, doc):
             node = self._start_new_heading(heading, len(leader))
             if text == '':
                 return
+        else:
+            node = nodes.container()
 
         self._parse_text_into_node(text, node)
         self._cur_doc = None
-- 
2.47.1