Use Context.emptyArgs, not null to denote null-arity method call for consistency.

js/rhino/src/org/mozilla/javascript/JavaMembers.java

@@ -95,7 +95,7 @@ class JavaMembers
         try {
             if (member instanceof BeanProperty) {
                 BeanProperty bp = (BeanProperty) member;
-                rval = bp.getter.invoke(javaObject, null);
+                rval = bp.getter.invoke(javaObject, Context.emptyArgs);
                 type = bp.getter.method().getReturnType();
             } else {
                 Field field = (Field) member;