Although employers are generally required to withhold taxes on IRA distributions, which they believe are includible in gross income, they do not have to withhold if they give the distributee certain notice relating to your electing not to have withholding. If your employer did give you that notice, then there was no requirement for withholding.
As a practical matter, if the employer did withhold any tax, you should get the 1099 changed. Otherwise, you will have to pay the tax.