Do I need to submit a Maryland form 510 if my pass through entity made no income for the filing year?

I have been in the start-up phase of my pass-through entity and did not make any income through the entity in 2018. I received a notification that I had to file the MD form 510 to stay compliant; however, I also was informed that I don't need to file because I made no income. Do I need to file? And if so, what exactly do I have to put to tell the state that I made no money?