Fix completion value of empty catch block in the presence of destructuring.

test/mjsunit/harmony/destructuring.js

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
 // Flags: --harmony-destructuring-bind
 // Flags: --harmony-default-parameters
 
 (function TestObjectLiteralPattern() {
   var { x : x, y : y, get, set } = { x : 1, y : 2, get: 3, set: 4 };
   assertEquals(1, x);
@@ skipping 1113 matching lines @@
   try {
     throw [1, 2, 3];
   } catch ([foo, ...bar]) {
     assertEquals(1, foo);
     assertEquals([2, 3], bar);
   }
 
   assertEquals("hello", foo);
   assertEquals("world", bar);
   assertEquals(42, baz);
+
+  assertEquals(undefined, eval('try {throw {foo: 1, bar: 2}} catch({foo}) {}'));
+  assertEquals(undefined, eval('try {throw [1, 2, 3]} catch([x]) {}'));
 })();