Did I need to file a partnership LLC with no income or expenses?
You did not have to file if you have a multi-member LLC (by default treated as a partnership for federal income tax purposes) and the LLC had neither income nor expenses.
See https://www.irs.gov/instructions/i1065#en_US_2022_publink11392vd0e555
....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
