The NoResultFound should be the one in balanced rather than wac

[fangpenlin]

I noticed that the NoResultFound raised was the one from balanced in revision 1.0 client. However, it appears that becomes the one from wac in revision 1.1.

2014-04-21 11:31:52,489 ERROR [billy.models.base][Dummy-3] Failed to process transaction TX7SpmonpnuYoDt4JF1Yetsq, failure_count=1
Traceback (most recent call last):
  File "/Users/VictorLin/Documents/workspace/billy/billy/models/transaction.py", line 316, in process_one
    result = method(transaction)
  File "/Users/VictorLin/Documents/workspace/billy/billy/models/processors/balanced_payments.py", line 49, in callee
    return func(self, *args, **kwargs)
  File "/Users/VictorLin/Documents/workspace/billy/billy/models/processors/balanced_payments.py", line 333, in debit
    extra_kwargs=extra_kwargs,
  File "/Users/VictorLin/Documents/workspace/billy/billy/models/processors/balanced_payments.py", line 286, in _do_transaction
    record = self._get_resource_by_tx_guid(resource_cls, transaction.guid)
  File "/Users/VictorLin/Documents/workspace/billy/billy/models/processors/balanced_payments.py", line 254, in _get_resource_by_tx_guid
    .filter(**{'meta.billy.transaction_guid': guid})
  File "/Users/VictorLin/Documents/workspace/billy/env/lib/python2.7/site-packages/wac.py", line 788, in one
    raise NoResultFound()
NoResultFound

IMHO, that should be the one from balanced.