Title: winperf_if: fixed exception when using windows_if.ps1 in an old windows version
Level: 1
Component: checks
Class: fix
Compatible: compat
State: unknown
Version: 1.2.7i3
Date: 1435741362

The windows_if.ps1 plugin does not provide all informations on windows installations
older than Windows 2003. The winperf_if check was unable to work without the missing data.
This has been fixed.
