Fixes #15717 - Unable to assign a VM in Site to Cluster without Site #15763
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Fixes: #15717
Adds to existing IF statement for VirtualMachine.clean() (to match existing check for Device.clean()) to allow for VM to be assigned to a Cluster without a Site.
Updated existing VM test to check for this new use case, and added Device tests for Clusters with Sites matching/not matching as well.