Whoops, fix 404 handling when -v not specified

It resulted in

  Traceback (most recent call last):
    File "/opt/ztk-py3-status/get_pypi_status.py", line 266, in <module>
      main()
    File "/opt/ztk-py3-status/get_pypi_status.py", line 248, in main
      if args.verbose > 1 or not not_found:
  TypeError: unorderable types: NoneType() > int()