add test case for empty array #453

Job	Run time
Pass MSRV values to other jobs	2s
clippy/stable	25s
format/nightly	15s
cargo-careful	2m 14s
nostd/thumbv6m-none-eabi/stable	12s
cross_test/i686-unknown-linux-gnu/stable	1m 29s
docs/nightly	20s
cross_test/s390x-unknown-linux-gnu/stable	7m 30s
miri	8m 46s
blas-msrv	42s
tests/1.64.0	3m 48s
tests/beta	2m 58s
tests/stable	2m 46s
tests/nightly	3m 14s
conclusion	3s
	34m 44s

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