Fix `clippy::unnecessary_map_or` lint (#228) #755

Job	Run time
formatting	23s
cargo test (windows-latest)	2m 0s
cargo clippy (android) (armv7-linux-androideabi)	54s
cargo clippy (windows-latest)	1m 51s
cargo test (macos-latest)	43s
cargo clippy (android) (aarch64-linux-android)	1m 40s
cargo check (msrv) (windows-latest)	1m 28s
cargo clippy (macos-latest)	53s
cargo test (ubuntu-latest)	36s
cargo check (msrv) (macos-latest)	28s
cargo clippy (ubuntu-latest)	59s
cargo check (msrv) (ubuntu-latest)	22s
cargo clippy (android) (x86_64-linux-android)	1m 27s
cargo check (msrv) (android) (armv7-linux-androideabi)	22s
cargo doc (windows-latest)	3m 9s
typos	6s
cargo check (msrv) (android) (aarch64-linux-android)	40s
cargo doc (macos-latest)	24s
cargo check (msrv) (android) (x86_64-linux-android)	43s
cargo doc (ubuntu-latest)	23s
	19m 31s

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