[3.13] gh-103956: Fix trace
output in case of missing source line (GH-103958)
#118834
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Print only filename with lineno if linecache.getline() returns an empty string.
(cherry picked from commit 7c87ce7)
Co-authored-by: Radislav Chugunov [email protected]
trace
: line tracing output lacks newlines if source lines are not available #103956