add zwsps bc løöps

app/views/warehouse/order_mailer/order_shipped.text.erb

@@ -8,12 +8,12 @@
         tracking_here_if_tracking: if @order.tracking_number.present?
                                      "tracking number: #{link_to @order.tracking_number, @order.tracking_url}"
                                    else
-                                     ""
+                                     "​"
                                    end,
         usps_disclaimer_if_usps: if @order.might_be_slow?
                                    "<b>as a small nonprofit, we send most packages by USPS First Class Mail to save on postage. estimated delivery time: <ul><li>within USA: 3-7 days</li><li>outside USA: 4-6 weeks</li></ul>"
                                  else
-                                   ""
+                                   "​"
                                  end,
         via: @order.pretty_via
       }