Google docs are synchronized by Nuxeo Drive making the remote scan fail

2015-12-16 14:59:06,926 5751 139672992487168 DEBUG    nxdrive.engine.watcher.remote_watcher Remote full scan
2015-12-16 14:59:07,174 5751 139672992487168 DEBUG    nxdrive.engine.watcher.remote_watcher Remote scanning: /
2015-12-16 14:59:07,211 5751 139672992487168 DEBUG    nxdrive.engine.watcher.remote_watcher Remote scanning: /GoogleDocs
2015-12-16 14:59:07,211 5751 139673730422528 DEBUG    nxdrive.wui.application Updated icon state to: transferring
2015-12-16 14:59:07,288 5751 139672992487168 ERROR    nxdrive.engine.watcher.remote_watcher 'NoneType' object has no attribute 'lower'
Traceback (most recent call last):
  File "/home/ataillefer/sources/nuxeo/addons/nuxeo-drive/nuxeo-drive-client/nxdrive/engine/watcher/remote_watcher.py", line 335, in _handle_changes
    self._scan_remote()
  File "/home/ataillefer/sources/nuxeo/addons/nuxeo-drive/nuxeo-drive-client/nxdrive/engine/watcher/remote_watcher.py", line 109, in _scan_remote
    self._scan_remote_recursive(from_state, remote_info)
  File "/home/ataillefer/sources/nuxeo/addons/nuxeo-drive/nuxeo-drive-client/nxdrive/engine/watcher/remote_watcher.py", line 241, in _scan_remote_recursive
    mark_unknown=False, force_recursion=force_recursion)
  File "/home/ataillefer/sources/nuxeo/addons/nuxeo-drive/nuxeo-drive-client/nxdrive/engine/watcher/remote_watcher.py", line 211, in _scan_remote_recursive
    children_info = self._client.get_children_info(remote_info.uid)
  File "/home/ataillefer/sources/nuxeo/addons/nuxeo-drive/nuxeo-drive-client/nxdrive/client/remote_filtered_file_system_client.py", line 40, in get_children_info
    fs_item_id)
  File "/home/ataillefer/sources/nuxeo/addons/nuxeo-drive/nuxeo-drive-client/nxdrive/client/remote_file_system_client.py", line 115, in get_children_info
    return [self.file_to_info(fs_item) for fs_item in children]
  File "/home/ataillefer/sources/nuxeo/addons/nuxeo-drive/nuxeo-drive-client/nxdrive/client/remote_file_system_client.py", line 213, in file_to_info
    digest_algorithm = fs_item['digestAlgorithm'].lower().replace('-', '')
AttributeError: 'NoneType' object has no attribute 'lower'