Fix rtcp for no track

[roznawsk]

It may happen, that after removing_track, we still receive PLI for that track, which has been already removed from the transceiver.

Below are logs from the fishjam media server

pli-fail-logs.txt

[mickel8]

We should probably do the same for all other handle_rtcp_packet clauses 🤔

[roznawsk]

I added it in the other case, where we handle rtcp on an outbound track. Let me know if you think the issue can appear also on the inbound tracks.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 87.75%. Comparing base (363fae9) to head (d030474).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
lib/ex_webrtc/peer_connection.ex	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #170      +/-   ##
==========================================
- Coverage   87.82%   87.75%   -0.08%     
==========================================
  Files          45       45              
  Lines        2358     2360       +2     
==========================================
  Hits         2071     2071              
- Misses        287      289       +2     

Files with missing lines	Coverage Δ
lib/ex_webrtc/peer_connection.ex	85.65% <0.00%> (-0.26%)	⬇️

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[mickel8]

Thanks!

[mickel8]

Released as 0.6.1