it tried that and 'if order.stop == None'

both bug out with: 

nosetests
EE.E
======================================================================
ERROR: test_orders_limit (tests.finance.test_slippage.SlippageTestCase)
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Traceback (most recent call last):
  File "/home/tony/quantopian/zipline/tests/finance/test_slippage.py", line 107, in test_orders_limit
    open_orders
  File "/home/tony/quantopian/zipline/zipline/finance/slippage.py", line 122, in simulate
    if order.stop:
AttributeError: 'Order' object has no attribute 'stop'
-------------------- >> begin captured stdout << ---------------------
 

--------------------- >> end captured stdout << ----------------------

======================================================================
ERROR: test_orders_stop (tests.finance.test_slippage.SlippageTestCase)
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Traceback (most recent call last):
  File "/home/tony/quantopian/zipline/tests/finance/test_slippage.py", line 261, in test_orders_stop
    open_orders
  File "/home/tony/quantopian/zipline/zipline/finance/slippage.py", line 132, in simulate
    if order.limit:
AttributeError: 'Order' object has no attribute 'limit'
-------------------- >> begin captured stdout << ---------------------
 
 

--------------------- >> end captured stdout << ----------------------

======================================================================
ERROR: test_volume_share_slippage (tests.finance.test_slippage.SlippageTestCase)
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Traceback (most recent call last):
  File "/home/tony/quantopian/zipline/tests/finance/test_slippage.py", line 67, in test_volume_share_slippage
    open_orders
  File "/home/tony/quantopian/zipline/zipline/finance/slippage.py", line 122, in simulate
    if order.stop:
  File "/home/tony/quantopian/zipline/zipline/utils/protocol_utils.py", line 85, in __getattr__
    return self.__internal[key]
KeyError: u"'stop'\n-------------------- >> begin captured stdout << ---------------------\n \n\n--------------------- >> end captured stdout << ----------------------"

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