Fixes #36744 - VM tab (legacy UI) shows error in case host is not associated to VM

[goarsna]

Steps to reproduce:

1. Register a host
2. Go to hosts > My_Registered_Host > Dot menu > Legacy UI > VM tab

Actual Result:
An error is shown

Expected result:
Upon registration, the host is not associated to a VM. In case the host is not associated to a VM, the VM tab should not be visible at all.

[theforeman-bot]

Issues: #36744

[theforeman-bot]

Can one of the admins verify this patch?

[theforeman-bot]

Can one of the admins verify this patch?

[theforeman-bot]

Can one of the admins verify this patch?

[stejskalleos]

ok to test

[sbernhard]

If the host will associated, the uuid is set: https://github.com/theforeman/foreman/blob/develop/app/models/host/managed.rb#L584
Therefore, in my opinion this check is fine.

[sbernhard]

Thoughs about this @MariaAga ?

[MariaAga]

Are the test failures related?

[m-bucher]

Are the test failures related?

@MariaAga I do not think so. In fact I ran them in my forklift and it passed 🤔

bundle exec rails test -v test/controllers/unattended_controller_test.rb
[...]
UnattendedControllerTest::ubuntu#test_0002_should get a preseed finish script with multiple ips in the request header 0.54 = .

Maybe rerun the tests?

[MariaAga]

All green now, thanks everyone!

[goarsna]

And thanks @MariaAga for merging :)