(feat) error message on payzen misconfigured currency

CHANGELOG.md

@@ -1,6 +1,7 @@
 # Changelog Fab-manager
 
 - Italian language support (credits to https://crowdin.com/profile/olazzari)
+- Improved error message on payzen misconfigured currency
 - Fix a bug: broken admin notifications if an order has been paid
 - Fix a bug: unable to bulk update settings
 

app/exceptions/configuration_error.rb

@@ -0,0 +1,5 @@
+# frozen_string_literal: true
+
+# Raised when Fab-manager is misconfigured
+class ConfigurationError < StandardError
+end

lib/pay_zen/service.rb

@@ -113,6 +113,8 @@ class PayZen::Service < Payment::Service
 
   def payzen_amount(amount)
     currency = Setting.get('payzen_currency')
+    raise ConfigurationError, 'PayZen currency is not configured. Unable to process online payments.' if currency.nil?
+
     return amount / 100 if zero_decimal_currencies.any? { |s| s.casecmp(currency).zero? }
     return amount * 10 if three_decimal_currencies.any? { |s| s.casecmp(currency).zero? }