fix: do not panic when parsing invalid hashes #236

Job	Run time
Cross Build Only (x86_64-unknown-freebsd)	51s
Android Build Only (aarch64-linux-android)	1m 32s
Android Build Only (armv7-linux-androideabi)	1m 8s
cargo deny	29s
Checking docs	1m 19s
Checking fmt	39s
check_semver	1m 51s
clippy_check	1m 53s
codespell	5s
Cross Test (i686-unknown-linux-gnu)	1m 13s
Minimal Supported Rust Version	1m 1s
CI Test Suite / Tests (ubuntu-latest, stable, all)	1m 40s
CI Test Suite / Tests (ubuntu-latest, stable, none)	1m 0s
CI Test Suite / Tests (windows-latest, stable, all, x86_64-pc-windows-msvc)	2m 13s
CI Test Suite / Tests (ubuntu-latest, stable, default)	1m 5s
CI Test Suite / Tests (windows-latest, stable, none, x86_64-pc-windows-msvc)	1m 34s
CI Test Suite / Tests (macOS-arm-latest, stable, all)	1m 59s
CI Test Suite / Tests (windows-latest, stable, default, x86_64-pc-windows-msvc)	1m 51s
CI Test Suite / Tests (macOS-arm-latest, stable, none)	56s
CI Test Suite / Tests (macOS-arm-latest, stable, default)	1m 1s
	25m 20s

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