Do not leak directory info if append_index_html_on_directories = false #1042

Job	Run time
check-docs	55s
cargo-hack	1m 29s
cargo-public-api-crates	1m 2s
cargo-deny check (advisories)	21s
cargo-deny check (bans licenses sources)	22s
check	50s
test-msrv	5m 3s
test-versions (stable)	1m 38s
style	17s
test-versions (beta)	1m 37s
test-versions (nightly)	1m 33s
	15m 7s

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