fix: handling of empty allow-lists (#903) #106

Job	Run time
deny (bans licenses sources)	33s
test (ubuntu-latest, stable, x86_64-unknown-linux-gnu)	1m 11s
deny (advisories)	34s
fuzz (pica-record-ref, fuzz, fuzz-record-ref, 120)	3m 26s
test (ubuntu-latest, beta, x86_64-unknown-linux-gnu)	1m 15s
fuzz (pica-record-matcher, fuzz, fuzz-record-matcher, 200)	4m 46s
test (ubuntu-latest, nightly, x86_64-unknown-linux-gnu)	1m 1s
test (windows-latest, stable, i686-pc-windows-msvc)	3m 29s
fuzz (pica-path, fuzz, fuzz-path, 200)	5m 0s
test (macos-latest, stable, x86_64-apple-darwin)	1m 13s
fuzz (pica-format, fuzz, fuzz-format, 200)	5m 3s
fuzz (pica-query, fuzz, fuzz-query, 200)	5m 6s
rustdoc	20s
msrv	16s
outdated	4m 50s
clippy	18s
rustfmt	13s
udeps	1m 3s
publish	37s
ci	1s
	40m 15s

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