fix(packaging): Format `METADATA` correctly if given empty `requires_file` (#2771) An empty `requires_file` used to be okay, but at some point regressed to leaving an empty line (due to the `metadata.replace(...)`) in the `METADATA` file - rendering the wheel uninstallable. This PR initially attempted to solve that by introducing a new list that processed `METADATA` lines go into, rather than relying on repeated string replacement. But it seems like the repeated string replace actually did more than simply process one line at a time, so I reverted to a single substitution at the end.
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