Fix windows cpu plugin not to use numberofcores property on Windows Server 2003 R2. Fix windows cpu plugin to return nil if numberofcores property doesn't exist on the Win32_Processor
Fix windows cpu plugin not to use numberofcores property on Windows Server 2003 R2.
Fix windows cpu plugin to return nil if numberofcores property doesn't exist on the Win32_Processor

This property doesn't exist on Win2k3 unless user has patched their system.

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