bugfix: code of difflayer not assgin before return #21
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Description
Bugfix for diff layer may have nil code even there is a new smart contract created in the block.
Rationale
When doing Commit of StateDB, the difflayer is returned while the commmitTrie routine may assign the code of difflayer in the future.
This bug will impact the diff sync: difflayer may not contains the all changed codes.