'Do not fail when there is no data and when sb clicks
"Show relative frequencies".
GH-2383
GH-2428'

def test_no_distributions(self):

    self.send_signal(self.widget.Inputs.data, None)
    self.widget.cb_rel_freq.click()
    self.send_signal(self.widget.Inputs.data, self.data)
    self.widget.cb_rel_freq.setChecked(False)
    self.widget.cb_rel_freq.click()
    self.send_signal(self.widget.Inputs.data, None)
    self.widget.cb_rel_freq.setChecked(True)
    self.widget.cb_rel_freq.click()
