Mac Alias files

Version: Bagger 2.8.1
OS: Mac OS X 10.14.6
Steps to reproduce:
* create new bag
* add 2 Mac Alias files (627 bytes and 590 bytes)
* click "save as.." button
* type in filepath
* click save
Expected outcome: Bag is saved with the copy of 2 Mac Alias files
Actual outcome: The size of the 2 files are both Zero bytes

