trie, core, eth: use db.has over db.get where possible

cmd/geth/snapshot.go

@@ -418,8 +418,7 @@ func traverseRawState(ctx *cli.Context) error {
 					// Check the present for non-empty hash node(embedded node doesn't
 					// have their own hash).
 					if node != (common.Hash{}) {
-						blob := rawdb.ReadTrieNode(chaindb, node)
-						if len(blob) == 0 {
+						if !rawdb.HasTrieNode(chaindb, node) {
 							log.Error("Missing trie node(storage)", "hash", node)
 							return errors.New("missing storage")
 						}