fix ut case of TestBlockchainWithTxDAGDebug

[andyzhang2023]

Description

The ut TestBlockchainWithTxDAGDebug failed and report two errors:

1. invalid gas used:

        --- FAIL: TestBlockchainWithTxDAG/InvalidBlocks/bcStateTests/transactionFromSelfDestructedContract.json/transactionFromSelfDestructedContract_London (0.00s)
            block_test.go:134: test in path mode with snapshotter failed: block #1 insertion into chain failed: invalid gas used (remote: 95603 local: 70603)
        --- FAIL: TestBlockchainWithTxDAG/InvalidBlocks/bcStateTests/transactionFromSelfDestructedContract.json/transactionFromSelfDestructedContract_Merge (0.00s)
            block_test.go:134: test in path mode with snapshotter failed: block #1 insertion into chain failed: invalid gas used (remote: 95603 local: 70603)
        --- FAIL: TestBlockchainWithTxDAG/InvalidBlocks/bcStateTests/transactionFromSelfDestructedContract.json/transactionFromSelfDestructedContract_Shanghai (0.01s)
            block_test.go:134: test in path mode with snapshotter failed: block #1 insertion into chain failed: invalid gas used (remote: 95603 local: 70603)

2. invalid mercle root:

            block_test.go:134: test in path mode with snapshotter failed: block #2 insertion into chain failed: invalid merkle root (remote: 602b01d9587fd41105414b9cb65d20918836a971e664fd8184b1cc99fce6b618 local: c76d6f3b4866e53c0bc66eb62890efff73b99196a34c235bb29b3771f98e98da) dberr: %!w(<nil>)

cause of invalid gas used

UncommittedDB forgets to load the code of an object before checking whether it is empty or not, which makes the method Empty() possiblely return false.

cause of invalid mercle root

(Unknown, to be continued)

[sunny2022da]

LGTM