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fallback to 'map_or' to fix Linux build error. #1866

Job	Run time
Build Rust stable on ubuntu-20.04, release=true features=	1m 26s
Build Rust stable on ubuntu-20.04, release=true features=missing-pixi-permitted	1m 44s
Build Rust stable on ubuntu-20.04, release=false features=	57s
Build Rust stable on ubuntu-20.04, release=false features=missing-pixi-permitted	1m 3s
Build Rust stable on windows-2019, release=true features=	3m 1s
Build Rust stable on windows-2019, release=true features=missing-pixi-permitted	3m 8s
Build Rust stable on windows-2019, release=false features=	2m 10s
Build Rust stable on windows-2019, release=false features=missing-pixi-permitted	2m 13s
Build Rust stable on macos-13, release=true features=	2m 38s
Build Rust stable on macos-13, release=true features=missing-pixi-permitted	2m 48s
Build Rust stable on macos-13, release=false features=	1m 36s
Build Rust stable on macos-13, release=false features=missing-pixi-permitted	1m 38s
Build Rust nightly on ubuntu-20.04, release=false features=	32s
Build Rust nightly on windows-2019, release=false features=	1m 23s
Build Rust nightly on macos-13, release=false features=	1m 11s
	27m 28s

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