Should still subselect tiles based on whether "done" even if thrunight isn't specified

[akremin]

This line:

desispec/py/desispec/workflow/science_selection.py

Line 137 in 33d11ac

if not all_tiles and len(sci_etable) > 0 and complete_tiles_thrunight is not None:

needs to be changed to remove the check on complete_tiles_thrunight. get_completed_tiles() can accept a None value for the argument and we do want to pass through get_completed_tiles() because that subselects tiles for other reasons as well, such as for "doneness".