pysrt.open() returns empty list

[HappyNinja2]

I downloaded a sample subtitle from OpenSutitle but when I run the following code, it just returns an empty list:

    result = chardet.detect(rawdata)
    charenc = result['encoding']
     subs = pysrt.open(file_path, encoding=charenc)

The code works for some subtitles but for some it just returns an empty list.

I have attached the subtitle with the problem (renamed the extension to *.txt, so it could be uploaded to github)

1951678632.txt