If you use wallet.change_gap_limit with a value below the current gap
limit, you get this exception:
`>> wallet.change_gap_limit(1)
Traceback (most recent call last):
File "lib\wallet.py", line 1455, in change_gap_limit
elif value >= self.min_acceptable_gap():
File "lib\wallet.py", line 1479, in min_acceptable_gap
addresses = self.account.get_receiving_addresses()
AttributeError: 'Standard_Wallet' object has no attribute 'account'
>> `