[RTC-157] Fix sending paddings when there is no active/current variant

[mickel8]

No description provided.

[codecov]

Codecov Report

Merging #252 (46adb60) into master (247a3c3) will increase coverage by 0.05%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #252      +/-   ##
==========================================
+ Coverage   57.77%   57.82%   +0.05%     
==========================================
  Files          38       38              
  Lines        1788     1788              
==========================================
+ Hits         1033     1034       +1     
+ Misses        755      754       -1     

Impacted Files	Coverage Δ
...rane_rtc_engine/endpoints/webrtc/track_receiver.ex	50.56% <0.00%> (ø)
lib/membrane_rtc_engine/tees/tee.ex	88.75% <0.00%> (+1.25%)	⬆️

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