FastFlix: Selecting a source file throws an error

@cdgriffith Nice work. This will become really handy.

Unfortunately I was not able to try it out yet, because it’s throwing an error when I try to select a source file.

Log:

2020-07-13 20:18:06,727 - flix    DEBUG    running probe command: "C:\Program Files\ffmpeg\bin\ffprobe.EXE" -v quiet -print_format json -show_format -show_streams "N:/source.mkv"
2020-07-13 20:18:07,727 - flix    DEBUG    running command: "C:\Program Files\ffmpeg\bin\ffprobe.EXE" -v quiet -print_format json -show_format -show_streams "N:/source.mkv"
2020-07-13 20:18:07,896 - flix    ERROR    Exception in 'update_video_info': from_json requires a string or filename - args: (<flix.widgets.main.Main(0x28b51d44ce0) at 0x0000028B5281DB48>,)
2020-07-13 20:18:07,897 - flix    ERROR    Exception in 'open_file': from_json requires a string or filename - args: (<flix.widgets.main.Main(0x28b51d44ce0) at 0x0000028B5281DB48>,)
Traceback (most recent call last):
  File "flix\widgets\main.py", line 167, in <lambda>
  File "site-packages\reusables\wrappers.py", line 270, in wrapper
  File "site-packages\reusables\wrappers.py", line 262, in wrapper
  File "flix\widgets\main.py", line 472, in open_file
  File "site-packages\reusables\wrappers.py", line 270, in wrapper
  File "site-packages\reusables\wrappers.py", line 262, in wrapper
  File "flix\widgets\main.py", line 579, in update_video_info
  File "flix\flix.py", line 381, in parse_hdr_details
  File "site-packages\box\box.py", line 613, in from_json
  File "site-packages\box\converters.py", line 65, in _from_json
box.exceptions.BoxError: from_json requires a string or filename