Shopify/active_utils — pull request #32 by melari (2014-05-08 20:14:11+00:00)
Title: Raise InvalidCurrencyCodeError instead of NoMethodError for nil currencies

Trivially small followup to https://github.com/Shopify/active_utils/pull/30. Makes more sense to get an InvalidCurrencyCodeError than a NoMethodError when trying to standardize a nil currency code

@jeromecornet
@Smcchoi