fix: support a verkle pre-tree at the conversion block #313
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The current conversion code panics if it tries to create a proof at the first block. This is because the previous tree is a MPT and no verkle proof can be made against the MPT.
As a result, this PR swaps the MPT with an empty verkle tree, so the proof will be against an empty verkle tree, which is the correct interpretation of a transition proof.