function sortParser (path, currentList) {
	if (!currentList) {
		throw new Error('No currentList selected');
	}
	if (!path) return currentList.expandSort(currentList.defaultSort);
	return currentList.expandSort(path);
}
Returns an expanded sort object, given a sort path and currentList object.

@param { String } path, a string representation of a list of columns.
@param { Object } the current instantiation of the List prototype used for the <List/> scene
@return { Object } an expanded representation of the sort path passed in.