[3.10] bpo-34266: [pdb] handle ValueError from shlex.split() (GH-26656) (GH-27006)

(cherry picked from commit d968a638fcbf9030c999cfacd4c9bf0656e779c4)

Co-authored-by: Irit Katriel <1055913+iritkatriel@users.noreply.github.com>