Fix test_basic_synchronization_suspend on Windows

[INFO]      [exec] FAIL nuxeo-drive-client/tests/test_synchronization_suspend.py::TestSynchronizationSuspend::test_basic_synchronization_suspend
[INFO]      [exec] ================================== FAILURES ===================================
[INFO]      [exec] ________ TestSynchronizationSuspend.test_basic_synchronization_suspend ________
[INFO]      [exec] self = <tests.test_synchronization_suspend.TestSynchronizationSuspend testMethod=test_basic_synchronization_suspend>
[INFO]      [exec] result = <TestCaseFunction 'test_basic_synchronization_suspend'>
[INFO]      [exec]     def run(self, result=None):
[INFO]      [exec]         orig_result = result
[INFO]      [exec]         if result is None:
[INFO]      [exec]             result = self.defaultTestResult()
[INFO]      [exec]             startTestRun = getattr(result, 'startTestRun', None)
[INFO]      [exec]             if startTestRun is not None:
[INFO]      [exec]                 startTestRun()
[INFO]      [exec]         self._resultForDoCleanups = result
[INFO]      [exec]         result.startTest(self)
[INFO]      [exec]         testMethod = getattr(self, self._testMethodName)
[INFO]      [exec]         if (getattr(self.__class__, "__unittest_skip__", False) or
[INFO]      [exec]             getattr(testMethod, "__unittest_skip__", False)):
[INFO]      [exec]             # If the class or method was skipped.
[INFO]      [exec]             try:
[INFO]      [exec]                 skip_why = (getattr(self.__class__, '__unittest_skip_why__', '')
[INFO]      [exec]                             or getattr(testMethod, '__unittest_skip_why__', ''))
[INFO]      [exec]                 self._addSkip(result, skip_why)
[INFO]      [exec]             finally:
[INFO]      [exec]                 result.stopTest(self)
[INFO]      [exec]             return
[INFO]      [exec]         try:
[INFO]      [exec]             success = False
[INFO]      [exec]             try:
[INFO]      [exec]                 self.setUp()
[INFO]      [exec]             except SkipTest as e:
[INFO]      [exec]                 self._addSkip(result, str(e))
[INFO]      [exec]             except KeyboardInterrupt:
[INFO]      [exec]                 raise
[INFO]      [exec]             except:
[INFO]      [exec]                 result.addError(self, sys.exc_info())
[INFO]      [exec]             else:
[INFO]      [exec]                 try:
[INFO]      [exec] >                   testMethod()
[INFO]      [exec] cleanUpSuccess = True
[INFO]      [exec] orig_result = <TestCaseFunction 'test_basic_synchronization_suspend'>
[INFO]      [exec] result     = <TestCaseFunction 'test_basic_synchronization_suspend'>
[INFO]      [exec] self       = <tests.test_synchronization_suspend.TestSynchronizationSuspend testMethod=test_basic_synchronization_suspend>
[INFO]      [exec] success    = False
[INFO]      [exec] testMethod = <bound method TestSynchronizationSuspend.test_basic_synchronization_suspend of...pend.TestSynchronizationSuspend testMethod=test_basic_synchronization_suspend>>
[INFO]      [exec] ..\deploy-dir\drive-2.7.13-python\lib\unittest\case.py:329: 
[INFO]      [exec] _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
[INFO]      [exec] self = <tests.test_synchronization_suspend.TestSynchronizationSuspend testMethod=test_basic_synchronization_suspend>
[INFO]      [exec]     def test_basic_synchronization_suspend(self):
[INFO]      [exec]         local = self.local_client_1
[INFO]      [exec]         remote = self.remote_document_client_1
[INFO]      [exec]         self.engine_1.start()
[INFO]      [exec]         self.wait_sync(wait_for_async=True)
[INFO]      [exec]         # Let's create some document on the client and the server
[INFO]      [exec]         local.make_folder('/', 'Folder 3')
[INFO]      [exec] >       self.make_server_tree()
[INFO]      [exec] local      = <tests.win_local_client.WindowsLocalClient object at 0x04BD7270>
[INFO]      [exec] remote     = <RemoteDocumentClient base_folder=None, blob_timeout=60, check_suspended=None,...3SF5V2PSVOUZC4CRBQLRIA\\tmp\\tmppyfleu-nxdrive-uploads', user_id='driveuser_1'>
[INFO]      [exec] self       = <tests.test_synchronization_suspend.TestSynchronizationSuspend testMethod=test_basic_synchronization_suspend>
[INFO]      [exec] nuxeo-drive-client\tests\test_synchronization_suspend.py:29: 
[INFO]      [exec] _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
[INFO]      [exec] self = <tests.test_synchronization_suspend.TestSynchronizationSuspend testMethod=test_basic_synchronization_suspend>
[INFO]      [exec] deep = True
[INFO]      [exec]     def make_server_tree(self, deep=True):
[INFO]      [exec]         remote_client = self.remote_document_client_1
[INFO]      [exec]         # create some folders on the server
[INFO]      [exec]         folder_1 = remote_client.make_folder(self.workspace, u'Folder 1')
[INFO]      [exec]         folder_2 = remote_client.make_folder(self.workspace, u'Folder 2')
[INFO]      [exec]         if deep:
[INFO]      [exec]             folder_1_1 = remote_client.make_folder(folder_1, u'Folder 1.1')
[INFO]      [exec] >           folder_1_2 = remote_client.make_folder(folder_1, u'Folder 1.2')
[INFO]      [exec] deep       = True
[INFO]      [exec] folder_1   = '9ffc019e-6292-451d-800b-8df4bba4e0e6'
[INFO]      [exec] folder_1_1 = 'fc47e9cf-bfa8-4402-87a1-775582352666'
[INFO]      [exec] folder_2   = '9efbbbc0-3596-4dbf-b1f1-026cc7c64f92'
[INFO]      [exec] remote_client = <RemoteDocumentClient base_folder=None, blob_timeout=60, check_suspended=None,...3SF5V2PSVOUZC4CRBQLRIA\\tmp\\tmppyfleu-nxdrive-uploads', user_id='driveuser_1'>
[INFO]      [exec] self       = <tests.test_synchronization_suspend.TestSynchronizationSuspend testMethod=test_basic_synchronization_suspend>
[INFO]      [exec] nuxeo-drive-client\tests\common_unit_test.py:627: 
[INFO]      [exec] _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
[INFO]      [exec] self = <RemoteDocumentClient base_folder=None, blob_timeout=60, check_suspended=None,...3SF5V2PSVOUZC4CRBQLRIA\\tmp\\tmppyfleu-nxdrive-uploads', user_id='driveuser_1'>
[INFO]      [exec] parent = '9ffc019e-6292-451d-800b-8df4bba4e0e6', name = 'Folder 1.2'
[INFO]      [exec] doc_type = 'Folder'
[INFO]      [exec]     def make_folder(self, parent, name, doc_type=FOLDER_TYPE):
[INFO]      [exec]         # TODO: make it possible to configure context dependent:
[INFO]      [exec]         # - SocialFolder under SocialFolder or SocialWorkspace
[INFO]      [exec]         # - Folder under Folder or Workspace
[INFO]      [exec]         # This configuration should be provided by a special operation on the
[INFO]      [exec]         # server.
[INFO]      [exec]         parent = self._check_ref(parent)
[INFO]      [exec]         doc = self.create(parent, doc_type, name=name,
[INFO]      [exec]                     properties={'dc:title': name})
[INFO]      [exec] >       return doc[u'uid']
[INFO]      [exec] E       TypeError: 'NoneType' object has no attribute '__getitem__'
[INFO]      [exec] doc        = None
[INFO]      [exec] doc_type   = 'Folder'
[INFO]      [exec] name       = 'Folder 1.2'
[INFO]      [exec] parent     = '9ffc019e-6292-451d-800b-8df4bba4e0e6'
[INFO]      [exec] self       = <RemoteDocumentClient base_folder=None, blob_timeout=60, check_suspended=None,...3SF5V2PSVOUZC4CRBQLRIA\\tmp\\tmppyfleu-nxdrive-uploads', user_id='driveuser_1'>
[INFO]      [exec] nuxeo-drive-client\nxdrive\client\remote_document_client.py:153: TypeError