Q. Do I have to file taxes if I didn't make any money last year, but only a school form 1098 T?
A. Simple answer: yes. And you want to file as Married Filing Jointly (MFJ) with your spouse.
But taxes are complicated, not simple. You, individually, are not required to file a tax return if you have no income. But, you would need to review your 1098-T to sure none of your scholarship is taxable. Then, if it was, whether it was enough to meet the filing requirement.
As others have already said, you are not allowed to claim an education/tuition credit if you file individually (Married Filing Separately-MFS). But you are allowed a (usually) generous tuition credit if you file MFJ.
Although your spouse is technically not allowed to claim you as a dependent, by filing as MFJ, you/he get all the benefits of a dependent and much more.
Bottom line: you need to file a joint return and enter the 1098-T.
