Do not fail on virtualized windows systems (#1669)

this handles virtualized systems without Win32_ComputerSystemProduct entries by returning 'unknown' for system product name

Co-authored-by: Bjoern Brauer <zaubernerd@zaubernerd.de>

client/system/info_windows.go

@@ -165,6 +165,10 @@ func sysProductName() (string, error) {
 	if err != nil {
 		return "", err
 	}
+	// `ComputerSystemProduct` could be empty on some virtualized systems
+	if len(dst) < 1 {
+		return "unknown", nil
+	}
 	return dst[0].Name, nil
 }