bug 1525719: handle 404 in client-side nav (#5429)
bug 1525719: handle 404 in client-side nav (#5429)


mozilla/kuma,SphinxKnight/kuma,mozilla/kuma,Elchi3/kuma,SphinxKnight/kuma,Elchi3/kuma,escattone/kuma,mozilla/kuma,a2sheppy/kuma,mozilla/kuma,a2sheppy/kuma,escattone/kuma,SphinxKnight/kuma,a2sheppy/kuma,SphinxKnight/kuma,SphinxKnight/kuma,a2sheppy/kuma,escattone/kuma,SphinxKnight/kuma,Elchi3/kuma,a2sheppy/kuma,mozilla/kuma,Elchi3/kuma,Elchi3/kuma