Tax help for military filers

Hi, thank you for taking the time to help me.

 

1. Yes, I am a US citizen (naturalization) with passport. My husband has no connection with the US. We live in Germany, I am a stay at home mom with a 1 year old baby, and he works for Germany already for 8 years. I came here 4 years ago and worked for the US garrison until I gave birth, payed regular taxes so far. 

2. I am trying to file my taxes, even if its zero income, but I am unable to proceed since its the first time I am filling taxes after getting married and I am filling alone, but it does not give me the option to proceed since it is asking me to put in his ssn which he doesnt have nor can i write anything else it brings me back to that article when filling. 

3. shouldnt I do my taxes and file a return even with 0 income or is it not mandatory? 

 

Thank you in advance again for your time and help