Don't render directory entries from zips

Some packages (e.g. dumb-init's wheels) have entries in the zip file for
directories for some reason, even though almost all zips and wheels I've
looked at don't.

Author: chriskuehl

pypi_browser/packaging.py

@@ -46,6 +46,7 @@ def _package_entries_from_zipfile(path: str) -> typing.Set[PackageEntry]:
                 mode=stat.filemode(entry.external_attr >> 16),
             )
             for entry in zf.infolist()
+            if not entry.is_dir()
         }