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

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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