AttributeError: 'NoneType' object has no attribute 'encode'

[kr4t0n]

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Describe the bug
AttributeError: 'NoneType' object has no attribute 'encode'

To Reproduce
Steps to reproduce the behavior:

1. Command line arguments you are using.
2. A complete copy of command line output of the autosub. You can use Ctrl-A and Ctrl-C to copy all of them. Use the following markdown code block syntax is recommended. Copy them into the place between ```.

autosub -i 1.mov -S ja-jp -D zh-cn

Traceback (most recent call last):
  File "/root/miniconda3/envs/autosub/bin/autosub", line 8, in <module>
    sys.exit(main())
  File "/root/miniconda3/envs/autosub/lib/python3.7/site-packages/autosub/__init__.py", line 159, in main
    styles_list=styles_list)
  File "/root/miniconda3/envs/autosub/lib/python3.7/site-packages/autosub/cmdline_utils.py", line 1369, in audio_or_video_prcs
    delete_chars=args.gt_delete_chars)
  File "/root/miniconda3/envs/autosub/lib/python3.7/site-packages/autosub/core.py", line 580, in list_to_googletrans
    service_urls=service_urls)
  File "/root/miniconda3/envs/autosub/lib/python3.7/site-packages/googletrans/client.py", line 62, in __init__
    'User-Agent': user_agent,
  File "/root/miniconda3/envs/autosub/lib/python3.7/site-packages/httpx/_models.py", line 480, in update
    headers = Headers(headers)
  File "/root/miniconda3/envs/autosub/lib/python3.7/site-packages/httpx/_models.py", line 395, in __init__
    for k, v in headers.items()
  File "/root/miniconda3/envs/autosub/lib/python3.7/site-packages/httpx/_models.py", line 395, in <listcomp>
    for k, v in headers.items()
  File "/root/miniconda3/envs/autosub/lib/python3.7/site-packages/httpx/_utils.py", line 53, in normalize_header_value
    return value.encode(encoding or "ascii")
AttributeError: 'NoneType' object has no attribute 'encode'

3. etc.

Expected behavior
Translate and obtain sub.

Screenshots
If applicable, add screenshots to help explain your problem. But it is not recommended using screenshots to demonstrate the commandline output unless you think it really matters.

Environment (please complete the following information):

• OS: (Ubuntu 5.4.0-6ubuntu1~16.04.12)
• Python Version: Python 3.7.7
• Autosub Version: autosub 0.5.7-alpha by Bing Ling

Additional context (Optional)
Add any other context about the problem here.

[BingLingGroup]

It seems that using different service urls could solve the problem ssut/py-googletrans#165 .
BTW, I will update py-googletrans in the next version of autosub.

[isuzjc]

It seems that using different service urls could solve the problem ssut/py-googletrans#165 .
BTW, I will update py-googletrans in the next version of autosub.

It doesn't work now.

[BingLingGroup]

@isuzjc It still works. You can just use different service url like translate.google.cn by option -surl "translate.google.cn" and it's OK.

[BingLingGroup]

Commit d1133b3 should fix this. Thanks for your report.