Empty fields can break paccor's SMBIOS parsing on Windows

[iadgovuser29]

OEM changed their SMBIOS value for CPU from
Serial number = "To Be Filled By O.E.M."
to
Serial number = " "

This causes the localhost-componentlist.json file to be corrupt when read in by pc_certgen.ps1.

Potential problem on line 495 of allcomponents.ps1