addUsersFromList.py: empty rows are skipped instead of attempting to parse
addUsersFromList.py: empty rows are skipped instead of attempting to parse

In the provided sample csv files, there are sometimes extra rows for a user
if they have more than one major. This was causing errors because the script
was trying to make a user out of no data. Now, these rows are just skipped

CSGreater-Developers/HMC-Grader,CSGreater-Developers/HMC-Grader,CSGreater-Developers/HMC-Grader,noellekimiko/HMC-Grader,noellekimiko/HMC-Grader,CSGreater-Developers/HMC-Grader,noellekimiko/HMC-Grader,noellekimiko/HMC-Grader,CSGreater-Developers/HMC-Grader,noellekimiko/HMC-Grader,noellekimiko/HMC-Grader