[6.8.0 - 6.8.1] VM template is deleted if cpu topology is not defined

Hi all,

this happens on both 6.8.0 and 6.8.1 (can't test previous versions).

Bug replication:

1- Have a virtual machine (mine is osx vm with the attached customized xml template - oskey is removed accordingly to forum rules); I'm specifying topology as a qemu:arg value with argument smp, so there's no <topology> line in the xml. All cores are pinned to this vm (16 cores); there's no cpu isolation.

2- Unraid webUI: Settings-->CPU pinning--> CPU pinning VM: all cores are selected:

3- Deselect some cores (in my example cores 0-7 are deselected):

4- Click apply: error "missing sockets attribute in cpu topology" pop up:

5- Click OK

6- in Unraid WebUI go to VM: you can see that the VM template has been deleted (luckily disks are in their places)

Issue description: Unraid should popup an error window or better be aware that the topology can be specified by qemu:arg (or not specified at all), but absolutely not deleting the vm template.

Take also into account that the <topology> line or the smp+topology are not a must for an osx vm, as they can lead to kernel panics, so one more case is no smp by qemu:arg and no <topology> line in the xml.

Thanks

Marking as minor, as the vm disks are not deleted, but some problems to rebuild the template if you have customized it and you didn't save it somewhere else.

xml-template.txt