asset throttling: don't be exhausted if there is no limit (#13112) #1318

Job	Run time
check-doc	7m 44s
check-bevy-internal-imports	3s
build (windows-latest)	6m 47s
check-cfg	1m 46s
build (ubuntu-latest)	3m 25s
check-missing-examples-in-docs	28s
build (macos-latest)	2m 46s
ci	3m 34s
miri	6m 20s
run-examples-macos-metal	4m 10s
toml	2m 4s
typos	8s
check-missing-features-in-docs	31s
markdownlint	1m 11s
check-compiles	5m 21s
build-wasm-atomics	1m 30s
build-wasm	1m 21s
msrv	1m 43s
	50m 52s

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