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Random NoneType error while downloading

See original GitHub issue

Version 1.0.0 (I just installed it today) Install via Python PIP OS: Linux Mint 20.3 Python Version: 3.8.10 Command: mangadex-dl --login-username (redacted) --login-password (redacted) --save-as tachiyomi --cover original --unsafe https://mangadex.org/title/c1d990dd-9ff2-4e47-b93d-5e56e34c5069/digimon-xros-wars

I know tachiyomi is supposed to be default but I was seeing it using raw format so I enforced it.

I’m not sure what is triggering this. If I restart the download it will go down and skip the files it grabbed then pickup just fine where it left off.

[ERROR] Unhandled exception, AttributeError: 'NoneType' object has no attribute 'startswith'
Traceback (most recent call last):
  File "/home/shinji/.local/lib/python3.8/site-packages/mangadex_downloader/cli/__init__.py", line 35, in _main
    download(args)
  File "/home/shinji/.local/lib/python3.8/site-packages/mangadex_downloader/cli/download.py", line 12, in download
    url(args, args.type)
  File "/home/shinji/.local/lib/python3.8/site-packages/mangadex_downloader/cli/url.py", line 144, in __call__
    self.func(self.id, args)
  File "/home/shinji/.local/lib/python3.8/site-packages/mangadex_downloader/cli/url.py", line 66, in download_manga
    dl_manga(*args)
  File "/home/shinji/.local/lib/python3.8/site-packages/mangadex_downloader/main.py", line 331, in download
    fmt.main()
  File "/home/shinji/.local/lib/python3.8/site-packages/mangadex_downloader/format/tachiyomi.py", line 61, in main
    success = downloader.download()
  File "/home/shinji/.local/lib/python3.8/site-packages/mangadex_downloader/downloader.py", line 172, in download
    self._report(resp, length, round((t2 - t1) * 1000), False)
  File "/home/shinji/.local/lib/python3.8/site-packages/mangadex_downloader/downloader.py", line 254, in _report
    if resp.headers.get('x-cache').startswith('HIT'):
AttributeError: 'NoneType' object has no attribute 'startswith'