Fix a bogus exception in Glob.

pkg/glob/test/list_test.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 import 'dart:async';
 import 'dart:io';
 
 import 'package:glob/glob.dart';
 import 'package:glob/src/utils.dart';
 import 'package:path/path.dart' as p;
@@ skipping 233 matching lines @@
       expect(schedule(() {
         var pattern = separatorToForwardSlash(
             p.absolute(p.join(sandbox, 'foo/baz/**')));
 
         return list(pattern);
       }), completion(unorderedEquals([
         p.join("foo", "baz", "bang"),
         p.join("foo", "baz", "qux")
       ])));
     });
+
+    test("lists a subdirectory that sometimes exists", () {
+      d.dir("top", [
+        d.dir("dir1", [
+          d.dir("subdir", [d.file("file")])
+        ]),
+        d.dir("dir2", [])
+      ]).create();
+
+      expect(list("top/*/subdir/**"),
+          completion(equals([p.join("top", "dir1", "subdir", "file")])));
+    });
   });
 }
 
 typedef Future<List<String>> ListFn(String glob,
     {bool recursive, bool followLinks});
 
 /// Runs [callback] in two groups with two values of [listFn]: one that uses
 /// [Glob.list], one that uses [Glob.listSync].
 void syncAndAsync(callback(ListFn listFn)) {
   group("async", () {
@@ skipping 28 matching lines @@
   }, 'creating sandbox');
 
   currentSchedule.onComplete.schedule(() {
     d.defaultRoot = null;
     if (sandbox == null) return null;
     var oldSandbox = sandbox;
     sandbox = null;
     return new Directory(oldSandbox).delete(recursive: true);
   });
 }