'Test on empty results.'

def test_empty_results(self):

    res = Results(data=self.iris[:0], store_data=True)
    res.row_indices = np.array([], dtype=int)
    res.actual = np.array([])
    res.predicted = np.array([[]])
    res.probabilities = np.zeros((1, 0, 3))
    self.send_signal(self.widget.Inputs.evaluation_results, res)
    self.widget.select_correct()
    self.widget.select_wrong()
