confirmation emails to buyers

rowers/views.py

@@ -1113,6 +1113,10 @@ def billing_view(request):
 def upgrade_view(request):
     r = getrequestrower(request)
 
+    if r.subscription_id is None or r.subscription_id == '':
+        url = reverse(billing_view)
+        return HttpResponseRedirect(url)
+
     if request.method == 'POST':
         billingaddressform = RowerBillingAddressForm(request.POST)
         planselectform = PlanSelectForm(request.POST,paymentprocessor='braintree')