Use uploaderEmails instead of uploaders

app/models/package_version.py

 # Copyright (c) 2012, 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 copy
 import json
 import tarfile
 
 from google.appengine.api import memcache
 from google.appengine.ext import db
@@ skipping 315 matching lines @@
                                       id=str(self.version),
                                       format='tar.gz'),
             'pubspec': self.pubspec
         }
 
         if full:
             value.update({
                 'created': self.created.isoformat(),
                 'downloads': self.downloads,
                 'libraries': self.libraries,
-                'uploader': self.uploader.email()
+                'uploader': self.uploaderEmail
             })
 
         return value