[ChandraChaan]

write_scene_list() only writes the Timecode List: label when a cut_list is passed. Without one, the conditional expression covers the whole row:

["Timecode List:", *cut_list]
if cut_list
else [start.get_timecode() for start, _ in scene_list[1:]]

so the derived cut list is written with no label, and a single scene gives an empty first row. The CLI always passes a cut list, but API callers relying on the documented default (include_cut_list=True, cut list "generated using the start times of each scene following the first one") get a different first row. write_scene_list_html() already applies the label to both cases.

The label now precedes the cut list whether it is passed or derived. Added test_write_scene_list_cut_list_row_without_cut_list and a changelog entry under 0.7.3.

Verified on my fork:

• Test only, on current main: fails on all 20 build jobs, e.g. AssertionError: assert '00:00:01.000,00:00:02.000' == 'Timecode List:,00:00:01.000,00:00:02.000' (1 failed, 613 passed). https://github.com/ChandraChaan/PySceneDetect/actions/runs/41401693465
• With the fix: all 20 build jobs pass. https://github.com/ChandraChaan/PySceneDetect/actions/runs/41401697347
• Static Analysis (ruff check, ruff format, pyright) passes. https://github.com/ChandraChaan/PySceneDetect/actions/runs/41401707117