Update check is never triggered if beta channel is activated and network is unavailable at startup

2016-06-06 13:41:32,841 33672 4597022720 WARNING  nxdrive.engine.workers Thread AppUpdater(4597022720) ended with exception : URLError(gaierror(8, 'nodename nor servname provided, or not known'),)
2016-06-06 13:41:32,843 33672 4597022720 ERROR    nxdrive.engine.workers <urlopen error [Errno 8] nodename nor servname provided, or not known>
Traceback (most recent call last):
  File "nxdrive/engine/workers.pyc", line 140, in run
  File "nxdrive/engine/workers.pyc", line 230, in _execute
  File "nxdrive/updater.pyc", line 122, in _poll
  File "nxdrive/manager.pyc", line 473, in get_version_finder
  File "nxdrive/manager.pyc", line 504, in _get_beta_update_url
  File "nxdrive/manager.pyc", line 530, in _refresh_engine_update_infos
  File "nxdrive/engine/engine.pyc", line 699, in get_update_infos
  File "nxdrive/client/remote_document_client.pyc", line 492, in get_update_info
  File "nxdrive/client/base_automation_client.pyc", line 365, in execute
URLError: <urlopen error [Errno 8] nodename nor servname provided, or not known>