fix(rtc): avoid KeyError in local_track_unpublished handler during te… #1533

Job	Run time
Build RTC wheels (x86_64)	55s
Build RTC wheels (AMD64)	1m 19s
Make RTC sdist	14s
Build RTC wheels (x86_64 arm64)	49s
Build RTC wheels (aarch64)	1m 31s
Generating protobuf	0s
Test (ubuntu-latest, Python 3.9) / Test (ubuntu-latest, Python 3.9)	1m 33s
Test (ubuntu-latest, Python 3.14) / Test (ubuntu-latest, Python 3.14)	1m 30s
Test (ubuntu-latest, Python 3.10) / Test (ubuntu-latest, Python 3.10)	1m 37s
Test (ubuntu-latest, Python 3.11) / Test (ubuntu-latest, Python 3.11)	1m 27s
Test (windows-latest, Python 3.9) / Test (windows-latest, Python 3.9)	2m 40s
Test (windows-latest, Python 3.14) / Test (windows-latest, Python 3.14)	1m 52s
Test (ubuntu-latest, Python 3.13) / Test (ubuntu-latest, Python 3.13)	1m 25s
Test (macos-latest, Python 3.14) / Test (macos-latest, Python 3.14)	2m 21s
Test (macos-latest, Python 3.9) / Test (macos-latest, Python 3.9)	2m 43s
Test (ubuntu-latest, Python 3.12) / Test (ubuntu-latest, Python 3.12)	1m 47s
Test (macos-latest, Python 3.12) / Test (macos-latest, Python 3.12)	2m 9s
Test (windows-latest, Python 3.12) / Test (windows-latest, Python 3.12)	1m 44s
Publish RTC release	-1s
docs	0s
	27m 35s

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