Fix `clippy::unnecessary_map_or` lint (#802) #2491

Job	Run time
cargo clippy (wasm32)	1m 51s
Prime LFS Cache	7s
cargo clippy (windows-latest)	5m 2s
cargo check (aarch64-android)	20s
formatting	29s
cargo test (wasm32)	23s
cargo clippy (macos-latest)	2m 3s
cargo clippy (ubuntu-latest)	3m 16s
cargo check (msrv) (windows-latest)	2m 5s
cargo check (msrv) (wasm32)	20s
cargo check (msrv) (macos-latest)	33s
cargo doc	1m 56s
cargo check (msrv) (ubuntu-latest)	39s
typos	5s
cargo test (windows-latest)	2m 44s
cargo test (macos-latest)	1m 27s
cargo test (ubuntu-latest)	2m 49s
	26m 9s

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