Description of problem:

1. Create a new VM from template, dont start it

2. Virtualization -> Virtual Machines -> VM -> Details

3. Under "Scheduling and resources requirements", click the pencil to edit Affinity Rules -> Add Affinity Rule

4. Fill the following

   Type: Node Affinity
   Condition: Preferred during scheduling (not default, change it)
   Weight: 100
   Node Labels
        Key                       Op     Values
        kubernetes.io/hostname    In     <your node hostname>

5. Click "Save Affinity Rule"

6. Click "Save"

7. Start the VM

8. Result:

Error creating pod: Pod "virt-launcher-rhel8-narrow-grasshopper-gqpln" is invalid: spec.affinity.nodeAffinity.requiredDuringSchedulingIgnoredDuringExecution.nodeSelectorTerms: Required value: must have at least one node selector term

9. Why? See what it did in the yaml...

    spec:
      affinity:
        nodeAffinity:
          preferredDuringSchedulingIgnoredDuringExecution:   <---- this is what I configured
          - preference:
              matchExpressions:
              - key: kubernetes.io/hostname
                operator: In
                values:
                - white.shift.toca.local
            weight: 100
          requiredDuringSchedulingIgnoredDuringExecution:     <--- I configured preferred only, I did not set any required rule
            nodeSelectorTerms: []                             <--- error above caused by this
        podAffinity: {}
        podAntiAffinity: {}

Version-Release number of selected component (if applicable):
4.10.9

How reproducible:
Always

Steps to Reproduce:
As above

Actual results:
VM wont start

Expected results:
Vm starts