Add a safeguard to glue livetest fixtures #1058

Job	Run time
check-commits	7s
build / build	14s
lint / lint (3.11)	29s
lint / lint (3.12)	35s
test / unittest	17s
docs / test	1m 1s
codeql / Analyze	1m 13s
docs / no-test	0s
test / test (nightly, /relocated/djnd/, true, 3.11)	15m 2s
test / test (latest, 3.11, true)	17m 28s
test / test (3.63, true, true, 3.10)	15m 30s
test / test (3.49, true, 3.10)	14m 51s
test / test (3.39, 3.12)	15m 43s
test / test (3.28, true, 3.13)	16m 25s
test / test (3.22, true, /relocated/djnd/, 3.9)	14m 38s
ready-to-ship	1s
	1h 53m 34s

Provide feedback