add test case for partition on empty array (#1504) #454

Job	Run time
Pass MSRV values to other jobs	2s
clippy/stable	14s
miri	8m 25s
nostd/thumbv6m-none-eabi/stable	11s
cross_test/s390x-unknown-linux-gnu/stable	5m 37s
cross_test/i686-unknown-linux-gnu/stable	1m 45s
cargo-careful	3m 12s
format/nightly	13s
docs/nightly	23s
tests/nightly	3m 24s
tests/1.64.0	3m 35s
blas-msrv	38s
tests/beta	2m 52s
tests/stable	2m 49s
conclusion	2s
	33m 22s

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