fix 500 error

finance/views.py

@@ -19,7 +19,8 @@ from django.utils.html import strip_tags
 
 from courses.models import Course
 from courses.api import CourseParamsApi
-from finance.models import Bill, Invoice, InvoiceRebilling
+from finance.models import Bill, Invoice, 
+ebilling
 from finance.serializers import BillSerializer, InvoiceSerializer
 from finance.tasks import setup_periodic_billing
 from lms.global_decorators import transaction_decorator
@@ -268,7 +269,7 @@ class YandexPay(APIView):
             pay = Payment.objects.get(id=pk)
             try:
                 inv = InvoiceRebilling.objects.get(yandex_pay=pay)
-            except InvoiceRebilling:
+            except InvoiceRebilling.DoesNotExist:
                 inv = None
             r = requests.post('https://money.yandex.ru/eshop.xml', data={
                 'shopId': pay.shop_id,
@@ -483,4 +484,4 @@ class DemoYandexCheckView(YandexCheckView):
 
 
 class DemoYandexAvisoView(YandexAvisoView):
-    pass
+    pass