Ignore empty space on end of file in CSV user/group uploads

[Aaron Wells]

Currently CSV uploads of users and groups error out if there are empty lines on the end of your file. It probably wouldn't be hard to ignore those.

To replicate:

1. Go to the "Add users by CSV" page or the "Update group members by CSV" page
2. Upload an otherwise valid CSV file that has two empty lines on the end
3. Submit it

Expected result: The program processes the CSV and ignores the empty lines
Actual result: The program gives you an error message about seeing an unexpected number of columns on the empty line