An empty search with limited only by date range fails to show constraints

[jkeck]

This appears to be due to an incompatibility between the Range Limit and Advanced Search plugins (and which query_has_constraints? gets used).

A potential solution is to override query_has_constraints? in our CatalogController and populate it with code that can handle the needs of both features.

There have been known friction with the using both of these gems simultaneously for some time (e.g. projectblacklight/blacklight_range_limit#5 and projectblacklight/blacklight_range_limit#58). Note that projectblacklight/blacklight_range_limit#5 describes this very issue but we tried the includes in the order described in that issue and it didn't appear to help, so not entirely sure if there is more going on here.