TypeError: 'NoneType' object is not iterable

[Thaumaturge2020]

issue1

• OS: mac os

• PyQt version: 5

• Error: Segmentation fault: 438

running with cElementTree on Python 2.5+
libpng warning: iCCP: known incorrect sRGB profile
Traceback (most recent call last):
  File "./roLabelImg.py", line 1364, in <module>
    sys.exit(main(sys.argv))
  File "./roLabelImg.py", line 1360, in main
    app, _win = get_main_app(argv)
  File "./roLabelImg.py", line 1352, in get_main_app
    win = MainWindow(argv[1] if len(argv) >= 2 else None,
  File "./roLabelImg.py", line 438, in __init__
    self.recentFiles = list(settings.get('recentFiles', []))
TypeError: 'NoneType' object is not iterable