chore: satisfy `clippy::unnecessary_map_or` #411

Job	Run time
cargo-deny	17s
Rustfmt (stable)	11s
Check (ubuntu-latest, stable)	38s
block-autosquash-commits	0s
Check (ubuntu-latest, beta)	36s
Check (windows-latest, stable)	2m 3s
Check (windows-latest, beta)	1m 37s
Check (macOS-latest, stable)	48s
Check (macOS-latest, beta)	35s
Documentation (stable)	31s
Test Suite (ubuntu-latest, stable)	1m 1s
Clippy (stable)	34s
Test Suite (ubuntu-latest, beta)	56s
Test Suite (windows-latest, stable)	2m 20s
Clippy (beta)	40s
Test Suite (windows-latest, beta)	2m 4s
Documentation (beta)	30s
Test Suite (macOS-latest, stable)	1m 4s
Test Suite (macOS-latest, beta)	1m 12s
	17m 37s

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