Catch InvalidVersion in setup.py to fall back to source build

[Chessing234]

Bug

get_wheel_url() in setup.py calls packaging.version.parse() on torch.__version__ and torch.version.cuda. In vendor PyTorch containers these can be non-PEP 440 strings (e.g. gpgpu.<build-id>), causing parse() to raise InvalidVersion.

Because CachedWheelsCommand.run() has no handler for this exception, the install aborts instead of falling back to a source build.

Root cause

get_wheel_url() (line 281/290) passes raw version strings to packaging.version.parse() without guarding against InvalidVersion. The existing try/except in run() only catches urllib.error.HTTPError from the download step — it never reaches that point.

Fix

Wrap the get_wheel_url() call with try/except InvalidVersion so the build falls back to super().run() (source compilation) when the version string cannot be parsed. This matches the existing fallback behavior for missing prebuilt wheels.

Fixes #947

[Chessing234]

Closing as duplicate of #961.