check if the attribute is set before deleting it with T_OBJECT_EX (fixes #7604)
Also, add a note to the docs about the better behavior of T_OBJECT_EX as
compared to T_OBJECT.
diff --git a/Doc/c-api/structures.rst b/Doc/c-api/structures.rst
index c4fb218..c2847e8 100644
--- a/Doc/c-api/structures.rst
+++ b/Doc/c-api/structures.rst
@@ -281,7 +281,10 @@
:cmacro:`T_OBJECT` and :cmacro:`T_OBJECT_EX` differ in that
:cmacro:`T_OBJECT` returns ``None`` if the member is *NULL* and
- :cmacro:`T_OBJECT_EX` raises an :exc:`AttributeError`.
+ :cmacro:`T_OBJECT_EX` raises an :exc:`AttributeError`. Try to use
+ :cmacro:`T_OBJECT_EX` over :cmacro:`T_OBJECT` because :cmacro:`T_OBJECT_EX`
+ handles use of the :stmt:`del` statement on that attribute more correctly
+ than :cmacro:`T_OBJECT`.
:attr:`flags` can be 0 for write and read access or :cmacro:`READONLY` for
read-only access. Using :cmacro:`T_STRING` for :attr:`type` implies