When no currency conversion record

[sbounmy]

def create_payment(amount_in_cents)
  self.coin_payments.create!(reason: 'sale', price: amount_in_cents, coin_type: :btc)
end

raises NoMethodError (undefined method `price' for nil:NilClass):

Because we havent imported currency conversions bundle exec rake cryptocoin_payable:process_prices

In dev env it's fine but not in test where datas are deleted on each run.

• rails g cryptocoin_payable:install should generate test/fixtures/cryptocoin_payable/currency_conversions.yml
• error should be more explicit for dev (exception to run bundle exec rake cryptocoin_payable:process_prices )