Ensure parent directories are created before writing files in FolderFileSink #55
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When a folder sink is used it only creates the root directory, but not any intermediary directories of files.
An example when this crash occurs is when a Zip is used as input format, while a folder is output.
Because the zip does not have directory entries it will not trigger putDirectory properly, causing a crash when it processes the first file in a directory (generally META-INF/METADATA.MF).