Fix orphan resource pool crash (Issue #24078) (#24079)

Fixes issue [#24078](https://github.com/ansible/ansible/issues/24078)

Resource pools are retrieved from VSphere regardless of the state of the `resource_pool` parameter. During this process, each retrieved Resource Pool is checked for the `parent` attribute, and if it exists, the currently-scoped parent object is compared against the Resource Pool's parent object. The method doing the check, however, `assert`s that the parent object is not `None`. In some cases, a Resource Pool will have the `parent` attr, but that `parent` object will be `None`, causing the `assert` to fail.

This should avoid that. :-)

lib/ansible/modules/cloud/vmware/vmware_guest.py

@@ -1011,7 +1011,7 @@ class PyVmomiHelper(object):
             if not rp[0]:
                 continue
 
-            if not hasattr(rp[0], 'parent'):
+            if not hasattr(rp[0], 'parent') or not rp[0].parent:
                 continue
 
             # Find resource pool on host