fix(db): Fix a sprout/history tree read panic in Zebra 1.4.0, which o… #9

Job	Run time
Check deny.toml bans	25s
Check deny.toml bans --features default-release-binaries	29s
Check deny.toml bans --all-features	29s
Check deny.toml sources	26s
Check deny.toml sources --features default-release-binaries	26s
Check deny.toml sources --all-features	56s
Check Cargo.lock is up to date	57s
Test stable on ubuntu-latest	32m 3s
Install zebrad from lockfile without cache on ubuntu-latest	8m 51s
Test beta on ubuntu-latest	29m 46s
Test stable on macos-latest	45m 0s
Check for unused dependencies	17s
Open or update issues for OS integration failures	0s
	2h 0m 5s

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