Fix error on summarising total_units

lib/reporting/reports/orders_and_fulfillment/order_cycle_supplier_totals.rb

@@ -25,9 +25,15 @@ module Reporting
               group_by: :producer,
               header: true,
               summary_row: proc do |_key, _items, rows|
+                total_units = rows.map(&:total_units)
+                summary_total_units = if total_units.all?(&:present?)
+                                        rows.sum(&:total_units)
+                                      else
+                                        " "
+                                      end
                 {
                   quantity: rows.sum(&:quantity),
-                  total_units: rows.sum(&:total_units),
+                  total_units: summary_total_units,
                   total_cost: rows.sum(&:total_cost)
                 }
               end

spec/lib/reports/orders_and_fulfillment/orders_cycle_supplier_totals_report_spec.rb

@@ -82,7 +82,7 @@ describe Reporting::Reports::OrdersAndFulfillment::OrderCycleSupplierTotals do
       expect(report_table[2][4]).to eq 0.601 # summary
     end
 
-    pending "is blank in summary when one line item misses a unit and another not" do
+    it "is blank in summary when one line item misses a unit and another not" do
       expect(report).to receive(:display_summary_row?).and_return(true)
 
       # This is not possible with the current code but was possible years ago.