diff -r 6ea964c78845 -r e6c5b5ee9fac src/share/classes/com/sun/tools/doclets/formats/html/markup/ContentBuilder.java
--- a/src/share/classes/com/sun/tools/doclets/formats/html/markup/ContentBuilder.java	Tue May 14 10:14:52 2013 -0700
+++ b/src/share/classes/com/sun/tools/doclets/formats/html/markup/ContentBuilder.java	Tue May 14 10:14:53 2013 -0700
@@ -40,7 +40,7 @@
 
     @Override
     public void addContent(Content content) {
-        if (content.isEmpty())
+        if ((content instanceof ContentBuilder) && content.isEmpty())
             return;
         ensureMutableContents();
         if (content instanceof ContentBuilder) {