addressed review comments

Author: sureshanaparti

server/src/main/java/com/cloud/network/element/VirtualRouterElement.java

@@ -768,7 +768,11 @@ public boolean saveSSHKey(final Network network, final NicProfile nic, final Vir
     @Override
     public boolean saveHypervisorHostname(NicProfile nicProfile, Network network, VirtualMachineProfile vm, DeployDestination dest) throws ResourceUnavailableException {
         final UserDataServiceProvider userDataUpdateProvider = _networkModel.getUserDataUpdateProvider(network);
-        if (userDataUpdateProvider != null && Provider.VirtualRouter.equals(userDataUpdateProvider.getProvider()) && vm.getVirtualMachine().getType() == VirtualMachine.Type.User) {
+        if (userDataUpdateProvider == null) {
+            s_logger.warn("Failed to update hypervisor host details, can't get user data provider");
+            return false;
+        }
+        if (Provider.VirtualRouter.equals(userDataUpdateProvider.getProvider()) && vm.getVirtualMachine().getType() == VirtualMachine.Type.User) {
             VirtualMachine uvm = vm.getVirtualMachine();
             UserVmVO destVm = _userVmDao.findById(uvm.getId());
             VirtualMachineProfile profile = null;