updateTitleDate.py - add try:except loop to address null values in source csv

[kgrons]

from @robertmhudson

Source CSV may include assets with no date, you could insert a try: except loop around the places that deal with the dates (maybe right as you’re parsing the csv?). I think it’s a value error, so that would be the except. That’ll just keep the script from breaking. As it is now, it will only complete if you feed it a csv with no null values in any of the date components.*

*removing null date value rows is the workaround til we figure out how to add in this try loop!