Your filing was correct and you do not file a Maryland return this year either. First things first: unemployment income is only taxable to the state where you are living in at the time when you receive it. You do not need a Maryland return for unemployment (unless you were living in Maryland when you received it.)
Did you need to file a Maryland nonresident return for past years? No, unless you were physically present in Maryland when you worked there. Maryland does not tax telecommuters who are working remotely from outside of Maryland.
Had the situation been reversed (living in MD, telecommuting to NY), you would have needed a nonresident return for New York. New York does tax the telecommuter working from outside the state on the convenience of the employer principle.
But you did not need Maryland nonresident returns for those years and will not file one this year either for the unemployment. (Note: if you have rental or some other income derived from inside of Maryland, you would need a return for that type of income).
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