vmware: Handle empty list attributes on vSphere objects

We want to switch the SOAP library backing oslo.vmware [1] and the new
library differs in how empty lists are returned. The old library SUDS
didn't set attributes if they were empty lists. The new library sets
those attributes to empty lists.

Therefore, every check with `hasattr()` that later on accesses a single
element instead of iterating over the whole list needs to be changed to
also check that the list contains elements. This ensures compatiblity
between the backend library versions.

[1] https://specs.openstack.org/openstack/oslo-specs/specs/victoria/oslo-vmware-soap-library-switch.html

Change-Id: I9322037cd47ace83fbcb19bbbe051e2feb9af2c7

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