Title: netapp_api_temp: Fixed exception when dealing with old discovered checks
Level: 1
Component: checks
Class: fix
Compatible: compat
State: unknown
Version: 1.2.7i1
Date: 1425385145

When services have been discovered with old versions, the discovered parameters
were None, which lead to an exception with the current check during checking.
Handling this kind of data now for compatiblity reasons.
