[STORY] LPS-35255 Display message in Navigation Configuration Preview when no navigation is available.

Hi Byran,

I'm sending a new pull for this story LPS that you created.

Please, close the original pull: https://github.com/blzaugg/liferay-portal/pull/33, because we don't need it anymore (http://issues.liferay.com/browse/AUI-894 has been created to solve the JS issue).

Please, review my changes & let me know if you have any concerns.

Thanks,
Tibor