change policy of PropertyResource to return the actual dereferenced value.

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@413541 13f79535-47bb-0310-9956-ffa450edef68

src/main/org/apache/tools/ant/types/resources/PropertyResource.java

@@ -107,8 +107,7 @@ public class PropertyResource extends Resource {
         if (isReference()) {
             return getCheckedRef().toString();
         }
-        return getName()!=null?("${"+getName()+"}")
-                :"null";
+        return String.valueOf(getValue());
     }
     
     /**