Fix crash when exported requirements contain Poetry warnings #392
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This PR changes the
Poetry.export
helper to detect and remove warnings in the command output. Any warnings found are written to standard error, so the user can see them.Background: Poetry writes warnings to standard output when exporting the requirements. This results in a parse error from
packaging
when it attempts to parse the warning as a requirement. A common case is the warning about an outdated lock file.Fixes #349