fix: the failure of load the legacy empty root

cosmos / iavl

Merkleized IAVL+ Tree implementation in Go

Apache License 2.0

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Closed cool-develope closed 1 year ago

cool-develope commented 1 year ago

fix the failure of loading the empty legacy root
refactor the legacy reference node to a new format which ensures the reference node is not legacy
update the version range checks in DeleteVersionTo