Situation:
In the Public Display Indices, an exhibition or publication only renders if there is an published artwork linked to it.
Complication:
Some of the exhibitions and publications we will want to include do not have an "included artwork." In the case of exhibitions, this might be because we know there was an artwork but we cannot identify it. In the case of publications, there may be a review of a show or a biographical article on the artist, that is important to include but does not include a discussion of a specific work of art.