Quick fix to ATMO-299 to address a 500 error thrown when the provider does not have an 'admin_driver'
ATMO-299 Make the missing admin_driver generic.

* Apply the same logic to the Hypervisor endpoint too.

	modified:   api/occupancy.py
Merge branch 'atmo-299'
Merge branch 'master' of github.com:iPlantCollaborativeOpenSource/atmosphere

Conflicts:
	api/occupancy.py