URI is OPTIONAL in EXT-X-MEDIA tag

[Lysander66]

URI is OPTIONAL in EXT-X-MEDIA tag, see rfc8216(https://datatracker.ietf.org/doc/html/rfc8216#section-4.3.4.1)

[codecov]

Codecov Report

Attention: 24 lines in your changes are missing coverage. Please review.

Comparison is base (75f058a) 69.32% compared to head (fa77cba) 69.36%.
Report is 4 commits behind head on main.

Files	Patch %	Lines
client_downloader_primary.go	0.00%	21 Missing ⚠️
pkg/playlist/multivariant_rendition.go	78.57%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #104      +/-   ##
==========================================
+ Coverage   69.32%   69.36%   +0.03%     
==========================================
  Files          42       42              
  Lines        3632     3649      +17     
==========================================
+ Hits         2518     2531      +13     
- Misses        928      931       +3     
- Partials      186      187       +1     

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[aler9]

Hello, thanks for this PR, i had to adapt the client in order to support this change. This has been merged.