[MPS] Do not dispatch empty job in `bitwise_not` (#87286)
Follows the pattern from https://github.com/pytorch/pytorch/pull/85285 and returns before computing dispatching an empty metal kernel for bitwise not operation.
Fixes crash when invoked with empty MPS tensor on AMD GPU
Pull Request resolved: https://github.com/pytorch/pytorch/pull/87286
Approved by: https://github.com/kulinseth
