Removed None arg check in test/test_decomp.py (#85402)
Not sure why this check was necessary? Tests seem to run fine without
it.
There were definitely tests this was skipping before that it shouldn't,
e.g., pretty much all of the tests for `torch.nn.functional.interpolate`
Pull Request resolved: https://github.com/pytorch/pytorch/pull/85402
Approved by: https://github.com/ezyang
