Fix the handling of empty args strings, on Windows #6460
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Closes #6403
As seen in Windows'
startup_items, if there's a startup item entry in the registry key which does not have an associated value, then an empty string is passed to a osquery helper function that tries to parse it into anargsarray. But it uses a Windows API that, if passed an empty string, fills in the command line args of the current osquery process, instead. This PR catches the empty string before that happens.