Issue 3931. Visit children nodes safely.

compiler/java/com/google/dart/compiler/ast/DartInitializer.java

Index: compiler/java/com/google/dart/compiler/ast/DartInitializer.java
diff --git a/compiler/java/com/google/dart/compiler/ast/DartInitializer.java b/compiler/java/com/google/dart/compiler/ast/DartInitializer.java
index cf64e94a273b9c14fc444f945353789762ffe479..c9d324b0033ef8da687a5c2fa5e0517ae5a10271 100644
--- a/compiler/java/com/google/dart/compiler/ast/DartInitializer.java
+++ b/compiler/java/com/google/dart/compiler/ast/DartInitializer.java
@@ -1,4 +1,4 @@
-// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
+// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
@@ -46,12 +46,8 @@ public class DartInitializer extends DartNode {
 
   @Override
   public void visitChildren(ASTVisitor<?> visitor) {
-    if (name != null) {
-      name.accept(visitor);
-    }
-    if (value != null) {
-      value.accept(visitor);
-    }
+    safelyVisitChild(name, visitor);
+    safelyVisitChild(value, visitor);
   }
 
   @Override