Do not automatically skip directory entries

[bicobus]

Directories might be empty and required by whatever is contained in the archive, as such skipping them from being included in the list of files shouldn't be a default behavior.

More over, the __init__ of Archive7z is so large that extending the class to circumvent that behavior is practically not possible.

Relevant code:

pylzma/py7zlib.py

Lines 983 to 986 in ccb0e7c

	# Skip all directory entries.
	attributes = info.get('attributes', None)
	if attributes and attributes & FILE_ATTRIBUTE_DIRECTORY != 0:
	continue