improve datacenter name handling

server/handler/vmCreate.go

@@ -79,8 +79,13 @@ func (h *Handler) VmCreate(w http.ResponseWriter, r *http.Request) {
 		//prettyPrint(vmObject)
 
 		// calculate VM properties we want to store
-		numRam = vmObject.Vm.Config.Hardware.MemoryMB
-		numVcpus = vmObject.Vm.Config.Hardware.NumCPU * vmObject.Vm.Config.Hardware.NumCoresPerSocket
+		if vmObject.Vm.Config != nil {
+			numRam = vmObject.Vm.Config.Hardware.MemoryMB
+			numVcpus = vmObject.Vm.Config.Hardware.NumCPU * vmObject.Vm.Config.Hardware.NumCoresPerSocket
+		} else {
+			h.Logger.Error("Empty VM config")
+		}
+
 	}
 	err = vc.Logout()
 	if err != nil {