Returns a Seaborn density chart

def _density_seaborn_(self, label=None, style=None, opts=None):
        """
        Returns a Seaborn density chart
        """
        try:
            fig = sns.kdeplot(self.df[self.x], self.df[self.y])
            fig = self._set_with_height(fig, opts)
            return fig
        except Exception as e:
            self.err(e, self.density_,
                     "Can not draw density chart")