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No key id `_id`

When I run, I get

2014-07-29 17:36:07-0400 [Travelodge] ERROR: Error processing {'available': False,
     'last_updated': datetime.datetime(2014, 7, 29, 17, 36, 7, 593666),
     'name': 'Travelodge'}
    Traceback (most recent call last):
      File "/Users/ford/Envs/HotelTracker/lib/python2.7/site-packages/scrapy/middleware.py", line 62, in _process_chain
        return process_chain(self.methods[methodname], obj, *args)
      File "/Users/ford/Envs/HotelTracker/lib/python2.7/site-packages/scrapy/utils/defer.py", line 65, in process_chain
        d.callback(input)
      File "/Users/ford/Envs/HotelTracker/lib/python2.7/site-packages/twisted/internet/defer.py", line 382, in callback
        self._startRunCallbacks(result)
      File "/Users/ford/Envs/HotelTracker/lib/python2.7/site-packages/twisted/internet/defer.py", line 490, in _startRunCallbacks
        self._runCallbacks()
    --- <exception caught here> ---
      File "/Users/ford/Envs/HotelTracker/lib/python2.7/site-packages/twisted/internet/defer.py", line 577, in _runCallbacks
        current.result = callback(current.result, *args, **kw)
      File "/Users/ford/projects/HotelTracker/hoteltracker/pipelines.py", line 41, in process_item
        item['id'] = existing_item['id']
      File "/Users/ford/Envs/HotelTracker/lib/python2.7/site-packages/scrapy/item.py", line 50, in __getitem__
        return self._values[key]
    exceptions.KeyError: 'id'

Seems it's being caused by the _id field not being populated. I removed it and things seem to generate fine.

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