add test case for empty array #447

Job	Run time
format/nightly	13s
Pass MSRV values to other jobs	2s
nostd/thumbv6m-none-eabi/stable	11s
clippy/stable	12s
miri	8m 19s
cargo-careful	2m 15s
cross_test/s390x-unknown-linux-gnu/stable	6m 1s
docs/nightly	19s
cross_test/i686-unknown-linux-gnu/stable	1m 24s
blas-msrv	36s
tests/stable	2m 43s
tests/beta	2m 32s
tests/1.64.0	3m 34s
tests/nightly	3m 12s
conclusion	2s
	31m 35s

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