There is a negative path in ToscaTemplate where a csar file is decompressed, and fails validation. In this case a null value for _getPath(String _path) is returned which results in _abort() being called.  This path in the code does not result in the decompressed folder being deleted.  

abort() could be modified to include CSAR.deleteDir

This was discovered during a unit test where an empty csar file was tested. It was decompressed but no further processing took place on the contents as there was nothing to process.