One of the Java 5 method overrides wasn't commented out, and its retu…

…rn value conflicts with Appendable. This could cause problems.

src/main/java/freemarker/template/utility/NullWriter.java

@@ -54,11 +54,11 @@ public Writer append(CharSequence csq, int start, int end) throws IOException {
         // Do nothing
         return this;
     }
-    */
 
     public Writer append(char c) throws IOException {
         // Do nothing
         return this;
     }
+    */
 
 }