Create list of absolute paths to be used to instantiate path objects
        for traversal, based on whether or not hidden attribute is set.

def getchildren(self):
        '''
        Create list of absolute paths to be used to instantiate path objects
        for traversal, based on whether or not hidden attribute is set.
        '''
        try:
            if self.hidden:
                return [os.path.join(self.name, child)
                        for child in sorted(self.listdir(self.name))]
            else:
                return [os.path.join(self.name, child)
                        for child in sorted(os.listdir(self.name))]
        except OSError:
            return None