Clear adjustments on subs orders when no items are able to be fulfilled

This prevents shipping and payment fees from being displayed in the notification email

app/jobs/subscription_placement_job.rb

@@ -34,6 +34,7 @@ class SubscriptionPlacementJob
 
     changes = cap_quantity_and_store_changes(order)
     if order.line_items.where('quantity > 0').empty?
+      order.adjustments.destroy_all
       return send_empty_email(order, changes)
     end
 

spec/jobs/subscription_placement_job_spec.rb

@@ -147,8 +147,9 @@ describe SubscriptionPlacementJob do
           allow(job).to receive(:unavailable_stock_lines_for) { order.line_items }
         end
 
-        it "does not place the order, sends an empty_order email" do
+        it "does not place the order, clears, all adjustments, and sends an empty_order email" do
           expect{ job.send(:process, order) }.to_not change{ order.reload.completed_at }.from(nil)
+          expect(order.reload.adjustments).to be_empty
           expect(job).to_not have_received(:send_placement_email)
           expect(job).to have_received(:send_empty_email)
         end