decoderからの読み取り時のNullチェックを追加 (#121) #1417

Job	Run time
build-linux (debian:sid-slim)	1m 41s
build-windows (stable-x86_64-pc-windows-gnu)	3m 13s
build-linux (debian:testing-slim)	1m 38s
build-windows (stable-x86_64-pc-windows-msvc)	5m 23s
build-windows-non-msys	6m 1s
build-linux (debian:stable-slim)	1m 40s
build-windows (nightly-x86_64-pc-windows-gnu)	3m 12s
build-linux (ubuntu:jammy)	1m 50s
build-windows (nightly-x86_64-pc-windows-msvc)	6m 5s
	30m 43s

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