[PULL v2 3/5] docs/qapidoc: support header-less freeform sections

[Markus Armbruster <armbru@redhat.com>]

From: John Snow <jsnow@redhat.com>

The code as written crashes when a free-form documentation block doesn't
start with a heading or subheading, for example:

| ##
| # Just text, no heading.
| ##

The code will attempt to use the `node` variable uninitialized. To fix,
create a generic block to insert the doc text into.

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

Fixes: 43e0d14ee09a (docs/sphinx: fix extra stuff in TOC after freeform QMP sections)
Signed-off-by: John Snow <jsnow@redhat.com>
Message-ID: <20250224033741.222749-5-jsnow@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
[Test updated to cover this]
Signed-off-by: Markus Armbruster <armbru@redhat.com>
---
 docs/sphinx/qapidoc.py          | 2 ++
 tests/qapi-schema/doc-good.json | 4 ++++
 tests/qapi-schema/doc-good.out  | 3 +++
 3 files changed, 9 insertions(+)

diff --git a/docs/sphinx/qapidoc.py b/docs/sphinx/qapidoc.py
index 5f96b46270..5a4d7388b2 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
diff --git a/tests/qapi-schema/doc-good.json b/tests/qapi-schema/doc-good.json
index f64bf38d85..0a4f139f83 100644
--- a/tests/qapi-schema/doc-good.json
+++ b/tests/qapi-schema/doc-good.json
@@ -11,6 +11,10 @@
 # = Section
 ##
 
+##
+# Just text, no heading.
+##
+
 ##
 # == Subsection
 #
diff --git a/tests/qapi-schema/doc-good.out b/tests/qapi-schema/doc-good.out
index ec277be91e..0a9da3efde 100644
--- a/tests/qapi-schema/doc-good.out
+++ b/tests/qapi-schema/doc-good.out
@@ -56,6 +56,9 @@ event EVT_BOXED Object
 doc freeform
     body=
 = Section
+doc freeform
+    body=
+Just text, no heading.
 doc freeform
     body=
 == Subsection
-- 
2.48.1