If you had no tax due you did not even need an extension. There is no penalty for filing after the deadline if you are getting a refund or have no tax due. Just file your tax return when you are ready. It can be e-filed up to October 15----after that e-filing will close down and you will have to file by mail.
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**