Added GetCode method

ethstate/state.go

@@ -49,6 +49,15 @@ func (self *State) GetNonce(addr []byte) uint64 {
 	return 0
 }
 
+func (self *State) GetCode(addr []byte) []byte {
+	stateObject := self.GetStateObject(addr)
+	if stateObject != nil {
+		return stateObject.Code
+	}
+
+	return nil
+}
+
 //
 // Setting, updating & deleting state object methods
 //

ethstate/state_object.go

@@ -297,8 +297,12 @@ func (c *StateObject) RlpEncode() []byte {
 	} else {
 		root = ""
 	}
+	var codeHash []byte
+	if len(c.Code) > 0 {
+		codeHash = ethcrypto.Sha3Bin(c.Code)
+	}
 
-	return ethutil.Encode([]interface{}{c.Nonce, c.Balance, root, ethcrypto.Sha3Bin(c.Code)})
+	return ethutil.Encode([]interface{}{c.Nonce, c.Balance, root, codeHash})
 }
 
 func (c *StateObject) RlpDecode(data []byte) {