Issue #327. A url for a non-existing gloss now returns an Http404.
Issue #327. A url for a non-existing gloss now returns an Http404.

Woseseltops/signbank,Signbank/NGT-signbank,Woseseltops/signbank,Woseseltops/signbank,Signbank/NGT-signbank,Signbank/NGT-signbank,Signbank/NGT-signbank,Woseseltops/signbank