Fixed the following NullReferenceException:
System.NullReferenceException:
in OpenHardwareMonitor.Hardware.Nvidia.NvidiaGroup..ctor()
in OpenHardwareMonitor.Hardware.Computer.Open()
in OpenHardwareMonitor.GUI.MainForm..ctor()
in OpenHardwareMonitor.Program.Main()

 (binary:application/x-msdos-program)