Missing return for link.is_wheel==True

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- [x] I have searched the [issues](https://github.com/python-poetry/poetry/issues) of this repo and believe that this is not a duplicate.



- **OS version and name**: macOS:latest
- **Poetry version**: **1.1.12**
- **Link of a [Gist](https://gist.github.com/) with the contents of your pyproject.toml file**: 

## Issue

According to PR #4962, there is the question left, if `pass` should not be replaced by a `return`. This would be also consistent with the typing definition `Optional[Link]`.

https://github.com/python-poetry/poetry/blob/1aa4d5b8b0114baa9e878e5692addbebb62c3e72/src/poetry/installation/chef.py#L44-L47

At the moment 
```python 
archives = self.get_cached_archives_for_link(link)
``` 
will be always excetuded.

	def get_cached_archive_for_link(self, link: Link) -> Optional[Link]:
	# If the archive is already a wheel, there is no need to cache it.
	if link.is_wheel:
	pass

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Missing return for link.is_wheel==True #4966

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Missing return for link.is_wheel==True #4966

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