The HSA deduction is a deduction that you can claim for any post-tax personal funds that were applied to your HSA. If your HSA contributions were done entirely through your employer (whether or not it was matched by your employer in anyway) and was pre-tax, you will not see an amount in that line. Because the funds that you contributed directly through your employer's payroll are already not being taxed, you will not be able to take another deduction for the amount (basically, no double dipping).
