Trivial refactoring: remove redundant `super()`
diff --git a/src/main/java/org/codehaus/groovy/ast/expr/EmptyExpression.java b/src/main/java/org/codehaus/groovy/ast/expr/EmptyExpression.java
index c877f56..ae7d6c3 100644
--- a/src/main/java/org/codehaus/groovy/ast/expr/EmptyExpression.java
+++ b/src/main/java/org/codehaus/groovy/ast/expr/EmptyExpression.java
@@ -37,9 +37,7 @@
     /**
      * @see EmptyExpression#INSTANCE
      */
-    public EmptyExpression() {
-        super();
-    }
+    public EmptyExpression() {}
 
     @Override
     public Expression transformExpression(ExpressionTransformer transformer) {
diff --git a/src/main/java/org/codehaus/groovy/ast/stmt/EmptyStatement.java b/src/main/java/org/codehaus/groovy/ast/stmt/EmptyStatement.java
index 2353127..1199e33 100644
--- a/src/main/java/org/codehaus/groovy/ast/stmt/EmptyStatement.java
+++ b/src/main/java/org/codehaus/groovy/ast/stmt/EmptyStatement.java
@@ -29,12 +29,9 @@
     /**
      * @see EmptyStatement#INSTANCE
      */
-    public EmptyStatement() {
-        super();
-    }
+    public EmptyStatement() {}
 
     protected EmptyStatement(Map<?, ?> metaDataMap) {
-        super();
         super.setMetaDataMap(metaDataMap);
     }