Followup to r38525 (tweaks from r38400) -- don't put fragments on redlinks; they...

Followup to r38525 (tweaks from r38400) -- don't put fragments on redlinks; they won't be useful on the edit UI, which isn't a page view.
(I suppose it's dubious whether we should do the same to nonexitent special pages.... but fragments there wouldn't be too helpful either so no need for extra logic to add it back. :)