PEP610: handle optional vcs_info.requested_version #5274
Merged
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As per PEP610, presence of
vcs_info.requested_version
is optional indirect_url.json for vcs packages. Prior to this change, Poetry would
crash when loading an environment with a vcs package not installed by
Poetry.
This PR also contains a linting fix for issue introduced in #4520.
Reference:
https://www.python.org/dev/peps/pep-0610/#specification