Add ``allow_empty_param_list`` to functional optimizers (#62522)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/62522
Addresses https://github.com/pytorch/pytorch/issues/62481
Test Plan: Imported from OSS
Reviewed By: zou3519
Differential Revision: D30072074
Pulled By: andwgu
fbshipit-source-id: 1a5da21f9636b8d74a6b00c0f029427f0edff0e3
