just change the exception and not make a new exception

when hiding the macro


git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@278163 13f79535-47bb-0310-9956-ffa450edef68

src/main/org/apache/tools/ant/taskdefs/MacroInstance.java

@@ -384,7 +384,8 @@ public class MacroInstance extends Task implements DynamicAttribute, TaskContain
                 throw ProjectHelper.addLocationToBuildException(
                     ex, getLocation());
             } else {
-                throw new BuildException(ex.getMessage(), ex);
+                ex.setLocation(getLocation());
+                throw ex;
             }
         } finally {
             presentElements = null;