account.sell_price() no longer working if account doesn't have enough BTC

[unformatt]

Not sure if this is new or intermittent but account.sell_price (which hits /api/v1/prices/sell?qty=1) is throwing an empty Exception because Coinbase is returning:

{u'errors': [u"You don't have that many bitcoins in your account to sell."], u'success': False}