Created by: brynmrk
Replaces the functionality wherein nil is already included in the possible options of belongs_to. In the current functionality of administrate, if you add include_blank: true in f.select it would have double blank option in the selections.
Changes in spec/factories.rb where made by running:
rubocop \
--require rubocop-rspec \
--only FactoryBot/AttributeDefinedStatically \
--auto-correct