Removing try and except for conversion kwargs
The purpose of this MR is to only set f_ref = self.f_ref[0] for the conversion kwargs if len(f_ref) != len(labels) rather than setting f_ref, f_low and approx to the zeroth item.
The purpose of this MR is to only set f_ref = self.f_ref[0] for the conversion kwargs if len(f_ref) != len(labels) rather than setting f_ref, f_low and approx to the zeroth item.