Move has_search_parameters? into Blacklight::Catalog
This is a convenient method to use in a custom blacklight
implementation. see
https://github.com/sul-dlss/spotlight/commit/5e817b99050b448da196543f78ace0225a893254#diff-7ef82825d38ed0d7271a7cc87c280e3cR16
Merge pull request #828 from projectblacklight/move_has_search_parameters

Move has_search_parameters? into Blacklight::Catalog