Treat empty uploads as None when File(allow_none=True) - #418
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Empty strings, JSON null, and FileStorage without a filename were rejected even though allow_none was set.
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File(allow_none=True)already acceptedNonethrough marshmallow, but empty multipart uploads still failed:""becamemissing,"null"was invalid, and aFileStoragewith no filename was treated as a real file.Those empty values now deserialize to
Nonewhenallow_none=True. Existing required-field behavior is unchanged.Fixes #319.