ledger-tool: Make blockstore slot functional with no tx metadata (#2423) #4486

Job	Run time
android (ubuntu-20.04, x86_64-linux-android)	2m 46s
ios (macos-12, aarch64-apple-ios)	4m 10s
android (ubuntu-20.04, aarch64-linux-android)	3m 0s
ios (macos-12, x86_64-apple-ios)	5m 2s
android (ubuntu-20.04, i686-linux-android)	2m 55s
ios (macos-12, aarch64-apple-darwin)	6m 38s
android (ubuntu-20.04, armv7-linux-androideabi)	3m 5s
ios (macos-12, x86_64-apple-darwin)	5m 38s
error_reporting	0s
	33m 14s

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