'Score the student received on the problem, or None if there is no
score.
Returns:
dictionary
{\'score\': integer, from 0 to get_max_score(),
\'total\': get_max_score()}
NOTE (vshnayder): not sure if this was the intended return value, but
that\'s what it\'s doing now.  I suspect that we really want it to just
return a number.  Would need to change (at least) capa to match if we did that.'

def get_score(self):

    return None
