guard against searching for VMs with id nil

lib/fog/vsphere/models/compute/server.rb

@@ -290,11 +290,11 @@ def customvalues
         end
 
         def scsi_controllers
-          attributes[:scsi_controllers] ||= service.list_vm_scsi_controllers(id)
+          attributes[:scsi_controllers] ||= id.nil? ? [] : service.list_vm_scsi_controllers(id)
         end
 
         def nvme_controllers
-          attributes[:nvme_controllers] ||= service.list_vm_nvme_controllers(id)
+          attributes[:nvme_controllers] ||= id.nil? ? [] : service.list_vm_nvme_controllers(id)
         end
 
         def scsi_controller

lib/fog/vsphere/requests/compute/get_virtual_machine.rb

@@ -3,13 +3,17 @@ module Vsphere
     class Compute
       class Real
         def get_virtual_machine(id, datacenter_name = nil, folder = nil, recursive = false)
+          raise(Fog::Vsphere::Compute::NotFound, "The id of the virtual machine can't be nil") if id.nil?
+
           # The larger the VM list the longer it will take if not searching based on UUID.
           convert_vm_mob_ref_to_attr_hash(get_vm_ref(id, datacenter_name, folder, recursive))
         end
 
         protected
 
         def get_vm_ref(id, dc = nil, folder = nil, recursive = false)
+          raise(Fog::Vsphere::Compute::NotFound, "The id of the virtual machine can't be nil") if id.nil?
+
           raw_datacenter = find_raw_datacenter(dc) if dc
           vm = case is_uuid?(id)
                  # UUID based

lib/fog/vsphere/version.rb

@@ -1,5 +1,5 @@
 module Fog
   module Vsphere
-    VERSION = '3.7.1'.freeze
+    VERSION = '3.7.2'.freeze
   end
 end