AttributeError error of the fetchone function of the DictCursor class

[Yurii]

Hello! In version 0.2.2, the fetchone function raised an AttributeError error when row == None. In version 0.2.3, when row == None, {} is returned.
I would like to know the reason for this change. After the update, the logic in my application broke down.
Thank you in advance.

class DictCursor(Cursor):
    async def fetchone(self):
        row = await super(DictCursor, self).fetchone()
        if self._columns and row:
            return dict(zip(self._columns, row))
        else:
            raise AttributeError("Not fould valid columns")

async def fetchone(self):
        row = await super(DictCursor, self).fetchone()
        if self._columns:
            return dict(zip(self._columns, row)) if row else {}
        else:
            raise AttributeError("Invalid columns.")