Add safe operator

Author: lauragilgz

lib/cfonb/operation_details/ibe.rb

@@ -7,7 +7,7 @@ class IBE < Base
 
       def self.apply(operation, line)
         operation.creditor_identifier = line.detail[0..34].strip
-        operation.creditor_identifier_type = line.detail[35..-1].strip
+        operation.creditor_identifier_type = line.detail[35..-1]&.strip
       end
 
       CFONB::OperationDetails.register('IBE', self)

lib/cfonb/operation_details/ipy.rb

@@ -7,7 +7,7 @@ class IPY < Base
 
       def self.apply(operation, line)
         operation.debtor_identifier = line.detail[0..34].strip
-        operation.debtor_identifier_type = line.detail[35..-1].strip
+        operation.debtor_identifier_type = line.detail[35..-1]&.strip
       end
 
       CFONB::OperationDetails.register('IPY', self)