Bugfix of 65761: postgresql_privs fail after it's updated to 2.9.2 (#65903)

* Bugfix of 65761: postgresql_privs fail after it's updated to 2.9.2

* add changelog

(cherry picked from commit 9b85a51c64)

changelogs/fragments/65903-postgresql_privs_sort_lists_with_none_elements.yml

@@ -0,0 +1,2 @@
+bugfixes:
+- postgresql_privs - fix sorting lists with None elements for python3 (https://github.com/ansible/ansible/issues/65761).

lib/ansible/modules/database/postgresql/postgresql_privs.py

@@ -749,8 +749,16 @@ class Connection(object):
         executed_queries.append(query)
         self.cursor.execute(query)
         status_after = get_status(objs)
-        status_before.sort()
-        status_after.sort()
+
+        def nonesorted(e):
+            # For python 3+ that can fail trying
+            # to compare NoneType elements by sort method.
+            if e is None:
+                return ''
+            return e
+
+        status_before.sort(key=nonesorted)
+        status_after.sort(key=nonesorted)
         return status_before != status_after