[3.14] gh-142555: Fix null pointer dereference in array.__setitem__ via re-entrant __index__ (GH-142713) (#144396)

gh-142555: Fix null pointer dereference in array.__setitem__ via re-entrant __index__ (GH-142713)
(cherry picked from commit 39f16a93ef7b39c3fc5a1a5b706512168baee499)

Co-authored-by: AN Long <aisk@users.noreply.github.com>