vSphere:Fixed json output error in empty public_addresses

server/lib/deltacloud/drivers/vsphere/vsphere_driver.rb

@@ -178,7 +178,14 @@ def instances(credentials, opts=nil)
           if vm.guest[:net].empty?
             public_addresses = vm.macs.values.collect { |mac_address| InstanceAddress.new(mac_address, :type => :mac) }
           else
-            public_addresses = [InstanceAddress.new(vm.guest[:net].first[:ipAddress].first)]
+            ipaddress = ""
+            vm.guest[:net].each do |net|
+              unless net[:ipAddress].empty?
+                ipaddress = net[:ipAddress].first
+                break
+              end
+            end
+            public_addresses = [InstanceAddress.new(ipaddress)]
           end
           Instance.new(
             :id => properties[:name],