avoid KeyError when track is already unpublished (#743) #1622

Job	Run time
Make RTC sdist	16s
Build RTC wheels (aarch64)	1m 23s
Build RTC wheels (x86_64 arm64)	49s
Build RTC wheels (x86_64)	55s
Build RTC wheels (AMD64)	1m 14s
Generating protobuf	-7s
Test (ubuntu-latest, Python 3.14) / Test (ubuntu-latest, Python 3.14)	1m 29s
Test (macos-latest, Python 3.14) / Test (macos-latest, Python 3.14)	2m 5s
Test (ubuntu-latest, Python 3.12) / Test (ubuntu-latest, Python 3.12)	1m 23s
Test (ubuntu-latest, Python 3.11) / Test (ubuntu-latest, Python 3.11)	1m 24s
Test (ubuntu-latest, Python 3.13) / Test (ubuntu-latest, Python 3.13)	1m 40s
Test (ubuntu-latest, Python 3.9) / Test (ubuntu-latest, Python 3.9)	1m 31s
Test (macos-latest, Python 3.9) / Test (macos-latest, Python 3.9)	2m 52s
Test (windows-latest, Python 3.14) / Test (windows-latest, Python 3.14)	2m 0s
Test (macos-latest, Python 3.12) / Test (macos-latest, Python 3.12)	1m 48s
Test (windows-latest, Python 3.12) / Test (windows-latest, Python 3.12)	1m 53s
Test (ubuntu-latest, Python 3.10) / Test (ubuntu-latest, Python 3.10)	1m 39s
Test (windows-latest, Python 3.9) / Test (windows-latest, Python 3.9)	2m 42s
docs	0s
Publish RTC release	-1s
	26m 55s

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