Raise an exception when no metadata file is found#532
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When exploring python/cpython#143387, it became apparent that the
Nonereturn type forDistribution.metadata()has unexpected downstream behaviors (where resolution of metadata values raises an unexpectedAttributeErrorwhenNonehas noget_all).This change proposes that instead, when no metadata file is present, the API should raise an Exception, specifically, a
FileNotFoundErrorsubclass.