Fix instance of javac's empty warning.

Review at http://gwt-code-reviews.appspot.com/1598803

Review by: skybrian@google.com

git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@10761 8db76d5a-ed1c-0410-87a9-c151d255dfc7
diff --git a/user/test/com/google/gwt/dev/jjs/test/CompilerTest.java b/user/test/com/google/gwt/dev/jjs/test/CompilerTest.java
index c303ac0..e480282 100644
--- a/user/test/com/google/gwt/dev/jjs/test/CompilerTest.java
+++ b/user/test/com/google/gwt/dev/jjs/test/CompilerTest.java
@@ -716,6 +716,7 @@
 
   // CHECKSTYLE_OFF
 
+  @SuppressWarnings("empty")
   public void testEmptyStatements() {
     boolean b = false;