| ERROR | 'NoneType' object has no attribute 'lower'

[YotomiY]

Describe the bug
I ran the script : python main.py --model medium --tts en-US-EricNeural -> and all was going well until I had this error
| ERROR | 'NoneType' object has no attribute 'lower'
Full error (log)

  File "C:\Users\User\Help\Whisper-TikTok\main.py", line 547, in <module>
    loop.run_until_complete(main())
  File "C:\Users\User\anaconda3\Lib\asyncio\base_events.py", line 653, in run_until_complete
    return future.result()
           ^^^^^^^^^^^^^^^
  File "C:\Users\User\Help\Whisper-TikTok\main.py", line 209, in main
    highlight_words(srt_filename, subtitle_format=args.sub_format,
  File "C:\Users\User\Help\Whisper-TikTok\main.py", line 431, in highlight_words
    subtitle_format = subtitle_format.lower()
                      ^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'NoneType' object has no attribute 'lower'

Screenshots

Desktop:

• OS: Windows
• No GPU

Additional context
I'm loving this project!!

[YotomiY]

I solve It:

    if subtitle_format is not None:
        subtitle_format = subtitle_format.lower()

[MatteoFasulo]

I solve It:

    if subtitle_format is not None:
        subtitle_format = subtitle_format.lower()

Hi, thx for also reporting the solution.
I will make a small change to the main script introducing a default parameter for the CLI argument which is causing the issue.

I am glad to hear that you are enjoying the project!
~ Matteo