alphagov/EFG — pull request #240 by benpickles (2014-05-02 12:02:40+00:00)
Title: NULL better represents not having a value

Loans without a LoanCategory have a loan_category_id of 0 which makes this blow up: https://github.com/alphagov/EFG/blob/cff9d3ddb8db0210046f181a080e86316490d97f/app/rules/phase1_rules.rb#L36. NULL is a better fit.