IndexError when a selected line has fewer columns than the sort column #2

Claude reports: sorting fails with an IndexError when any selected line has fewer columns than the column picked, and the selection is left unchanged.

Tested on Sublime Text 4 build 4215 (Windows) with Column Sort 2.0.0 from Package Control. Selected these lines (tab separated):

name	qty
pear	3
apple	10
fig
cherry	7

then ran column_pick and chose qty. The console printed:

  File ".../ColumnSort.py", line 23, in run
    rows_cols_tail.sort(key=lambda col:col[col_num], reverse=ascending)
IndexError: list index out of range

Fix, tested here (loose copy of ColumnSort.py): change the key to key=lambda col:col[col_num] if col_num < len(col) else "". The same selection then sorts to name qty, fig, apple 10, pear 3, cherry 7: the header stays first and the short row sorts as an empty value.