Add message if no relations exist
Add message if no relations exist

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https://codereview.appspot.com/13253054

jrwren/juju-gui,bac/juju-gui,CanonicalJS/juju-gui,CanonicalJS/juju-gui,mitechie/juju-gui,CanonicalJS/juju-gui,bac/juju-gui,bac/juju-gui,bac/juju-gui,jrwren/juju-gui,jrwren/juju-gui,mitechie/juju-gui,mitechie/juju-gui,jrwren/juju-gui,mitechie/juju-gui