ContentNotUsable still being imported in subrip.py

[W-Hamra]

Describe the bug You recently removed the usage of ContentNotUsable in #2553

But in libs/pysubs2/subrip.py you are still doing from .exceptions import ContentNotUsable

This caused the below error in my instance:

 Traceback (most recent call last):
   File "/opt/bazarr/bazarr/main.py", line 22, in <module>
     from init import *  # noqa E402
   File "/opt/bazarr/bazarr/init.py", line 160, in <module>
     from app.announcements import get_announcements_to_file
   File "/opt/bazarr/bazarr/app/announcements.py", line 13, in <module>
     from app.get_providers import get_enabled_providers
   File "/opt/bazarr/bazarr/app/get_providers.py", line 7, in <module>
     import subliminal_patch
   File "/opt/bazarr/bazarr/../libs/subliminal_patch/__init__.py", line 7, in <module>
     from .subtitle import Subtitle, guess_matches
   File "/opt/bazarr/bazarr/../libs/subliminal_patch/subtitle.py", line 16, in <module>
     from pysubs2.subrip import parse_tags, MAX_REPRESENTABLE_TIME
   File "/opt/bazarr/bazarr/../libs/pysubs2/subrip.py", line 6, in <module>
     from .exceptions import ContentNotUsable
 ImportError: cannot import name 'ContentNotUsable' from 'pysubs2.exceptions'

Commenting out the import works for me.

Software (please complete the following information):

• Bazarr: [1.4.5]
• Radarr version [5.14.0.9383]
• Sonarr version [3.0.10]
• OS: [Ubuntu 20.04]

[W-Hamra]

Never mind. I see I had lingering old files from an unclean upgrade process :)