Return an initialized list of adjustment values based on the contents
        of *prstGeom*

def _initialized_adjustments(self, prstGeom):
        """
        Return an initialized list of adjustment values based on the contents
        of *prstGeom*
        """
        if prstGeom is None:
            return []
        davs = AutoShapeType.default_adjustment_values(prstGeom.prst)
        adjustments = [Adjustment(name, def_val) for name, def_val in davs]
        self._update_adjustments_with_actuals(adjustments, prstGeom.gd_lst)
        return adjustments