typing issue  in premerge

**Describe the bug**
typing issue 
```
mypy 0.961 (compiled: yes)
monai/transforms/utils_pytorch_numpy_unification.py:279:9: error: Returning Any from function declared to return "Union[ndarray[Any, Any], Tensor]"  [no-any-return]
Found 1 error in 1 file (checked 867 source files)
```

https://github.com/Project-MONAI/MONAI/runs/7020517619?check_suite_focus=true