fix(xo-server-netbox): fix site property null/undefined cases (#7145)

Introduced by 1d7559ded2

CHANGELOG.unreleased.md

@@ -11,6 +11,8 @@
 
 > Users must be able to say: “I had this issue, happy to know it's fixed”
 
+- [Netbox] Fix VMs' `site` property being unnecessarily updated on some versions of Netbox (PR [#7145](https://github.com/vatesfr/xen-orchestra/pull/7145))
+
 ### Packages to release
 
 > When modifying a package, add it here with its release type.
@@ -27,4 +29,6 @@
 
 <!--packages-start-->
 
+- xo-server-netbox patch
+
 <!--packages-end-->

packages/xo-server-netbox/src/index.js

@@ -402,7 +402,9 @@ class Netbox {
       cluster: nbVm.cluster?.id ?? null,
       status: nbVm.status?.value ?? null,
       platform: nbVm.platform?.id ?? null,
-      site: nbVm.site?.id,
+      // If site is not supported by Netbox, its value is undefined
+      // If site is supported by Netbox but empty, its value is null
+      site: nbVm.site == null ? nbVm.site : nbVm.site.id,
       // Sort them so that they can be compared by diff()
       tags: nbVm.tags.map(nbTag => ({ id: nbTag.id })).sort(({ id: id1 }, { id: id2 }) => (id1 < id2 ? -1 : 1)),
     })