Issues with WeMo Link on firmware WeMo_WW_2.00.10937.PVT-OWRT-Link

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In case others hit this issue, found that WeMo components would error out on startup. It turned out to be an issue since upgrading my WeMo Link firmware to WeMo_WW_2.00.10937.PVT-OWRT-Link. The error seen in the home-assistant.log was:

17-02-11 19:23:16 ERROR (MainThread) [homeassistant.bootstrap] Error during setup of component wemo
Traceback (most recent call last):
  File "/srv/hass/lib/python3.5/site-packages/homeassistant/bootstrap.py", line 151, in _async_setup_compone
nt
    None, component.setup, hass, config)
  File "/usr/lib/python3.5/asyncio/futures.py", line 361, in __iter__
    yield self  # This tells Task to wait for completion.
  File "/usr/lib/python3.5/asyncio/tasks.py", line 296, in _wakeup
    future.result()
  File "/usr/lib/python3.5/asyncio/futures.py", line 274, in result
    raise self._exception
  File "/usr/lib/python3.5/concurrent/futures/thread.py", line 55, in run
    result = self.fn(*self.args, **self.kwargs)
  File "/srv/hass/lib/python3.5/site-packages/homeassistant/components/wemo.py", line 81, in setup
    devices = [(device.host, device) for device in pywemo.discover_devices()]
  File "/home/hass/.homeassistant/deps/pywemo/discovery.py", line 28, in discover_devices
    device = device_from_description(entry.location, mac)
  File "/home/hass/.homeassistant/deps/pywemo/discovery.py", line 40, in device_from_description
    return device_from_uuid_and_location(uuid, mac, description_url)
  File "/home/hass/.homeassistant/deps/pywemo/discovery.py", line 56, in device_from_uuid_and_location
    return Bridge(location, mac)
  File "/home/hass/.homeassistant/deps/pywemo/ouimeaux_device/bridge.py", line 39, in __init__
    self.bridge_update()
  File "/home/hass/.homeassistant/deps/pywemo/ouimeaux_device/bridge.py", line 63, in bridge_update
    self.Groups[uniqueID] = Group(self, group)
  File "/home/hass/.homeassistant/deps/pywemo/ouimeaux_device/bridge.py", line 269, in __init__
    super(Group, self).__init__(bridge, info)
  File "/home/hass/.homeassistant/deps/pywemo/ouimeaux_device/bridge.py", line 92, in __init__
    self._update_state(info)
  File "/home/hass/.homeassistant/deps/pywemo/ouimeaux_device/bridge.py", line 283, in _update_state
    for c in capabilities.split(',')
AttributeError: 'NoneType' object has no attribute 'split'

Created a local fix which fixes the startup issue for me. Have created a PR in the pywemo project if others see this and want to apply a local fix - see https://github.com/pavoni/pywemo/pull/63/files

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