fix missing torchdata error message

[pmeier]

I missed that in #5672.

[pmeier]

We can drop the TypeError here since that was the error type of the legacy torchdata package hosted on PyPI. Since we took over the name, pip install torchdata will give you the correct package.

[NicolasHug]

What's the reason not to raise from error like before?

[pmeier]

After the removal of the TypeError, showing the excepted error adds no information:

try:
    import foo
except ImportError as error:
    raise ModuleNotFoundError("foo is not available") from error

Traceback (most recent call last):
  File "main.py", line 2, in <module>
    import foo
ModuleNotFoundError: No module named 'foo'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "main.py", line 4, in <module>
    raise ModuleNotFoundError("foo is not available") from error
ModuleNotFoundError: foo is not available

vs.

try:
    import foo
except ImportError as error:
    raise ModuleNotFoundError("foo is not available")

Traceback (most recent call last):
  File "main.py", line 2, in <module>
    import foo
ModuleNotFoundError: No module named 'foo'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "main.py", line 4, in <module>
    raise ModuleNotFoundError("foo is not available")
ModuleNotFoundError: foo is not available

vs.

try:
    import foo
except ImportError as error:
    raise ModuleNotFoundError("foo is not available") from None

Traceback (most recent call last):
  File "main.py", line 4, in <module>
    raise ModuleNotFoundError("foo is not available") from None
ModuleNotFoundError: foo is not available