Illegal characters in Link Name mess up publication buttons

(Bug, Investigate , Priority: Critical, Test Status: No automated tests yet , Reported By Bad Link: Thing 3y284oe not found, )
Summary:
Original report from Eric:
If you add an illegal character to the Link Name of a Publishable Thing, buttons like "Publish" and "Save as Minor Changes" don't close the Thing.
I'm surprised that it's even possible to have illegal characters in Link Names -- that may be the underlying more-serious bug. (And is why this is marked Critical, at least initially.)