added a function to handle decoding as utf-16 as a fallback if decodi…

[DerekFurstPitt]

…ng with utf-8 fails

[DerekFurstPitt]

@yuanzhou the alert its showing seems to have an issue with this:

def open_tsv(path):
    try:
        f =  open(path, newline='', encoding='utf-8-sig')
        f.read()
        f.seek(0)
    except UnicodeDecodeError:
        return open(path, newline='', encoding='utf-16')

particularly "path". It seems to think that this is a user provided value. However path actually comes from

 file_location = commons_file_helper.ensureTrailingSlash(
        app.config['FILE_UPLOAD_TEMP_DIR']) + temp_id + os.sep + file.filename
    tsvfile = open_tsv(file_location)

So not a user defined value unless i'm misunderstanding it