Hotfix: better handle atomicity in eboutic basket validation

eboutic/views.py

@@ -9,6 +9,7 @@ from django.shortcuts import render
 from django.core.urlresolvers import reverse_lazy
 from django.views.generic import TemplateView, View
 from django.http import HttpResponse, HttpResponseRedirect
+from django.core.exceptions import SuspiciousOperation
 from django.shortcuts import render
 from django.db import transaction, DataError
 from django.utils.translation import ugettext as _
@@ -177,10 +178,11 @@ class EtransactionAutoAnswer(View):
         except:
             return HttpResponse("Bad signature", status=400)
         if request.GET['Error'] == "00000":
+            try:
                 with transaction.atomic():
                     b = Basket.objects.filter(id=request.GET['BasketID']).first()
                     if b is None:
-                    return HttpResponse("Basket does not exists", status=400)
+                        raise SuspiciousOperation("Basket does not exists")
                     i = Invoice()
                     i.user = b.user
                     i.payment_method = "CARD"
@@ -190,7 +192,9 @@ class EtransactionAutoAnswer(View):
                             product_unit_price=it.product_unit_price, quantity=it.quantity).save()
                     i.validate()
                     b.delete()
+            except Exception as e:
+                return HttpResponse("Payment failed with error: "+repr(e), status=400)
             return HttpResponse()
         else:
-            return HttpResponse("Payment failed with error: "+request.GET['Error'])
+            return HttpResponse("Payment failed with error: "+request.GET['Error'], status=400)