Fix partition on empty arrays #444

Job	Run time
Pass MSRV values to other jobs	3s
clippy/stable	14s
format/nightly	14s
cross_test/s390x-unknown-linux-gnu/stable	6m 13s
nostd/thumbv6m-none-eabi/stable	19s
cross_test/i686-unknown-linux-gnu/stable	1m 23s
cargo-careful	2m 18s
docs/nightly	20s
miri	8m 11s
blas-msrv	39s
tests/nightly	3m 27s
tests/stable	3m 1s
tests/beta	3m 0s
tests/1.64.0	3m 43s
conclusion	2s
	33m 7s

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