routing: avoid unwrap in fallback path #6102

Job	Run time
check (.)	28s
check (examples)	33s
check-docs	21s
Spell Check with Typos	7s
cargo-hack	1m 4s
external-types	27s
cargo-deny check (advisories)	19s
cargo-deny check (bans licenses sources)	21s
dependencies-are-sorted	5s
test-msrv	0s
test-versions	0s
wasm32-unknown-unknown	0s
armv5te-unknown-linux-musleabi	-1s
test-nightly	-1s
	3m 43s

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