fix: handling of empty allow-lists #105

Job	Run time
deny (bans licenses sources)	33s
fuzz (pica-record-ref, fuzz, fuzz-record-ref, 120)	3m 28s
deny (advisories)	43s
test (ubuntu-latest, stable, x86_64-unknown-linux-gnu)	1m 12s
fuzz (pica-record-matcher, fuzz, fuzz-record-matcher, 200)	4m 49s
test (ubuntu-latest, beta, x86_64-unknown-linux-gnu)	1m 7s
fuzz (pica-path, fuzz, fuzz-path, 200)	5m 3s
test (ubuntu-latest, nightly, x86_64-unknown-linux-gnu)	52s
fuzz (pica-format, fuzz, fuzz-format, 200)	4m 59s
test (windows-latest, stable, i686-pc-windows-msvc)	3m 33s
fuzz (pica-query, fuzz, fuzz-query, 200)	5m 2s
test (macos-latest, stable, x86_64-apple-darwin)	1m 12s
clippy	18s
rustdoc	16s
msrv	21s
outdated	4m 49s
rustfmt	13s
udeps	56s
publish	0s
ci	0s
	39m 26s

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