[3.12] gh-65052: Prevent pdb from crashing when trying to display objects (GH-110578) (#110734)

gh-65052: Prevent pdb from crashing when trying to display objects (GH-110578)
(cherry picked from commit c523ce0f434582580a3721e15cb7dd6b56ad0236)

Co-authored-by: Tian Gao <gaogaotiantian@hotmail.com>