Notification message for only partially displayable sets of resources

[Aklakan]

Exhibit shows messages such as '10 Items could not be shown' when there are items that do not meet criteria for their visualization on e.g. a map.
Furthermore, upon clicking this message, exhibit shows the list of resources that cause the problems.

In the simplest form, this is:
"Among the resources matching the faceted search criteria, select those which are not related to the map by neither of the map links"

However, in the fp7 dataset, we are actually also interested in messages such as
"For n projects, there exist some partners without geometries".

For this use case, we would need a schema like:
[main-resource, geometry-resource, geometry-literal]
Whereas the geometry-literal may be null.

Any main-resource with a NULL entry for the literal is then considered incomplete for map display.