Who Must File
Domestic Partnerships
Except as provided below, every domestic
partnership must file Form 1065, unless it
neither receives income nor incurs any
expenditures treated as deductions or
credits for federal income tax purposes

If the partnership ended in 2019, it kinda sounds like they wouldn't have any income or expenses in 2020,   so I'll still stick with my answer.  If I had more faith in having someone at the IRS actually pay attention to a no change return, I would say go for it ------------- but I don't have that much faith.