[3.13] gh-103956: Fix `trace` output in case of missing source line (GH-103958) (GH-118834)

Print only filename with lineno if linecache.getline() returns an empty string.
(cherry picked from commit 7c87ce777b3fd9055b118a58ec8614901ecb45e9)

Co-authored-by: Radislav Chugunov <52372310+chgnrdv@users.noreply.github.com>