Tax help for military filers

Yes, we're filing a joint federal return. I have completed my PA (SLR while I was active duty military) state return online with no issue, but I'm running into a snag with MD state return. TurboTax recommends that I file as a nonresident (Form 505), but I believe I should file as a part-time resident (Form 502) as I lived in MD for half of 2018. That said, I have had no taxable income since moving to MD as I'm a full-time student. Should I file as a MD nonresident like TurboTax recommends?