build

Fix potential missed error in `Metadata::to_configuration` #121

Job	Run time
test	1m 23s
fmt	29s
clippy	29s
build (stable, --features "")	1m 29s
build (stable, --all-features)	1m 42s
build (stable, --no-default-features)	24s
build (1.71, --features "")	29s
build (1.71, --all-features)	1m 50s
build (1.71, --no-default-features)	29s
build (beta, --features "")	1m 23s
build (beta, --all-features)	1m 55s
build (beta, --no-default-features)	54s
build (nightly, --features "")	52s
build (nightly, --all-features)	1m 53s
build (nightly, --no-default-features)	42s
	16m 23s

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