fix: short-circuit in reveal_account_v2_proof_nodes on empty nodes

[klkvr]

Right now if reveal_account_v2_proof_nodes will receive an empty vec of nodes before the root node was revealed, it will always fail in else branch here

reth/crates/trie/sparse/src/state.rs

Lines 496 to 501 in ecf3fbe

	let trie = if let Some(root_node) = root_node {
	trace!(target: "trie::sparse", ?root_node, "Revealing root account node from V2 proof");
	self.state.reveal_root(root_node.node, root_node.masks, self.retain_updates)?
	} else {
	self.state.as_revealed_mut().ok_or(SparseTrieErrorKind::Blind)?
	};