Fix rubocop warning

app/controllers/admin/reports_controller.rb

@@ -56,7 +56,7 @@ module Admin
       @rendering_options = rendering_options
       @data = Reporting::FrontendData.new(spree_current_user)
 
-      variant_id_in = params[:variant_id_in]&.reject(&:blank?)
+      variant_id_in = params[:variant_id_in]&.compact_blank
       load_selected_variant if variant_id_in.present?
     end
 

lib/reporting/line_items.rb

@@ -24,9 +24,9 @@ module Reporting
       end
 
       # Filter by product
-      variant_id_in = @params[:variant_id_in].reject(&:blank?)
+      variant_id_in = @params[:variant_id_in]&.compact_blank
       if variant_id_in.present?
-        line_items = line_items.where("spree_line_items.variant_id": variant_id_in)
+        line_items = line_items.where('spree_line_items.variant_id': variant_id_in)
       end
 
       if line_item_includes.present?

spec/system/admin/reports/orders_and_fulfillment_spec.rb

@@ -179,7 +179,7 @@ describe "Orders And Fulfillment" do
 
       context "When filtering by product" do
         let(:variant1) { create(:variant, product: product, unit_description: "Big") }
-        let(:variant3) { create(:variant)}
+        let(:variant3) { create(:variant) }
 
         before do
           create(:line_item_with_shipment, variant: variant1, quantity: 1, order: order1)