Merge pull request #2595 from renyouhao/master

Remove redundant null check in Configuration#newExecutor()

Author: harawata

src/main/java/org/apache/ibatis/session/Configuration.java

@@ -698,7 +698,6 @@ public Executor newExecutor(Transaction transaction) {
 
   public Executor newExecutor(Transaction transaction, ExecutorType executorType) {
     executorType = executorType == null ? defaultExecutorType : executorType;
-    executorType = executorType == null ? ExecutorType.SIMPLE : executorType;
     Executor executor;
     if (ExecutorType.BATCH == executorType) {
       executor = new BatchExecutor(this, transaction);