[DataPipe] Fix mishandling of exception message when error is not iterable (#84676)
We sometimes get an exception message like this:
```
This exception is thrown by __iter__ of TarArchiveLoaderIterDataPipe(datapipe=FileOpenerIterDataPipe, length=-1, mode='r:') elif msg not in e.args[0] and single_iterator_msg not in e.args[0]:
TypeError: argument of type 'int' is not iterable
```
The `TypeError` raised by the mishandling of the error message obfuscates the true exception, which now will be show as:
```
FileNotFoundError: [Errno 2] No such file or directory:
```
Pull Request resolved: https://github.com/pytorch/pytorch/pull/84676
Approved by: https://github.com/ejguan
