Extract out overrideable Catalog#display_home_content? method

app/helpers/blacklight/catalog_helper_behavior.rb

@@ -206,6 +206,11 @@ def document_index_view_type query_params = params || {}
     end
   end
 
+  # Should we display special "home" splash screen content, instead of search results?
+  def display_splash_content?
+    !has_search_parameters?
+  end
+
   private
 
   # @param [String] format

app/views/catalog/index.html.erb

@@ -8,7 +8,7 @@
                                         view_config: conf) %>
 <% end %>
 
-<% unless has_search_parameters? %>
+<% if display_splash_content? %>
   <%# if there are no input/search related params, display the "home" partial -%>
   <%= render 'home' %>
   <%= render 'shared/sitelinks_search_box' %>

spec/views/catalog/index.html.erb_spec.rb

@@ -1,9 +1,9 @@
 # frozen_string_literal: true
 
 RSpec.describe "catalog/index.html.erb" do
-  describe "with no search parameters" do
+  describe "with splash content (no search parameters)" do
     before do
-      allow(view).to receive(:has_search_parameters?).and_return(false)
+      allow(view).to receive(:display_splash_content?).and_return(true)
       allow(view).to receive(:blacklight_config).and_return(CatalogController.blacklight_config)
       @response = instance_double(Blacklight::Solr::Response, empty?: true, total: 11, start: 1, limit_value: 10, aggregations: {})
     end
@@ -17,9 +17,9 @@
     end
   end
 
-  describe "with search parameters" do
+  describe "with results (search parameters)" do
     before do
-      allow(view).to receive(:has_search_parameters?).and_return(true)
+      allow(view).to receive(:display_splash_content?).and_return(false)
       stub_template "catalog/_results_pagination.html.erb" => ""
       stub_template "catalog/_search_header.html.erb" => "header_content"
       allow(view).to receive(:blacklight_config).and_return(Blacklight::Configuration.new)