fix ImportError: sys.meta_path is None

[luizoti]

Fix ImportError, AttributeError, maybe a generic Exception is more pratical

Exception ignored in: <bound method InputDevice.__del__ of InputDevice('/dev/input/event12')>
Traceback (most recent call last):
  File "/usr/local/lib/python3.6/dist-packages/evdev/device.py", line 160, in __del__
  File "/usr/local/lib/python3.6/dist-packages/evdev/device.py", line 305, in close
  File "/usr/local/lib/python3.6/dist-packages/evdev/eventio_async.py", line 55, in close
  File "/usr/lib/python3.6/asyncio/events.py", line 694, in get_event_loop
  File "/usr/lib/python3.6/asyncio/events.py", line 669, in get_event_loop_policy
  File "/usr/lib/python3.6/asyncio/events.py", line 662, in _init_event_loop_policy
ImportError: sys.meta_path is None, Python is likely shutting down

[gvalkov]

Thanks!