Fix error for non-registered order email notifications

api/orders.js

@@ -194,7 +194,10 @@ router.post('/:uuid/ship/tracking', ensureAdmin, parseJSON, async (req, res) =>
   const order = await db.order.setTracking(req.params.uuid, req.body.code, req.body.date || null, req.body.price_cents)
 
   const user = await db.order.getUser(order.uuid)
-  await email.sendShippingNotification(user, order)
+
+  // TODO: Handle sending email notifications to non-registered users
+  if(user)
+    await email.sendShippingNotification(user, order)
 
   res.json(order)
 })
@@ -227,7 +230,10 @@ router.post('/:uuid/ship/easypost', ensureAdmin, parseJSON, async (req, res) =>
   )
 
   const user = await db.order.getUser(order.uuid)
-  await email.sendShippingNotification(user, updatedOrder)
+
+  // TODO: Handle sending email notifications to non-registered users
+  if(user)
+    await email.sendShippingNotification(user, updatedOrder)
 
   res.json(updatedOrder)
 })