In FeedExporter.close_spider, it returns a deferred from inside a loop instead of adding it to deferred_list
deferred_list = 
for slot in self.slots:
if not slot.itemcount and not slot.store_empty:
# We need to call slot.storage.store nonetheless to get the file
# properly closed.
return defer.maybeDeferred(slot.storage.store, slot.file)
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