hidden folder in data directory of bag failing validation check

[chinuhub]

Given

• I have a bag
• And I add a hidden folder in the data direcotry of this bag

When

• I run bag.isValid()

Then

• the visit method of class PayloadFileExistsInAtLeastOneManifestVistor throws exception saying that 'this hidden folder is in payload directory but not in any manifest directory'. This happens even after passing a parameter in isValid that says to ignore hidden files.

[jscancella]

@chinuhub can you create a simple test that recreates the problem?