Fixes #37118 - Remove Virtual Guests in legacy UI for non hypervisors

[chris1984]

What are the changes introduced in this pull request?

• Virtual guests is returning an empty array when the host does not have any virtual guests. This is not present in the new UI, and I don't want to disrupt anything in the consumer.rb which could break something. Since the old UI will be going away soon and the issue is only present there, I just changed that section to hide that field/value if the array is empty.
• This does work correctly when virt-who reports in because then we do have values in the virtual_guest array, I did check this on my box and confirms the field shows up correctly.

Considerations taken when implementing this change?

• See above

What are the testing steps for this pull request?

• Register your devel box or a client to your Katello devel box
• Check out the old UI and see that is has a section called Virtual Guests (0)
• Check out PR
• Verify that section is gone

Screenshot before:

Screenshot after:

[jeremylenz]

Tested with my webpack5 setup, works well

thanks @chris1984 ! ACK 👍