General A/B testing.

[wolnelektury.git] / src / catalogue / api / views.py

diff --git a/src/catalogue/api/views.py b/src/catalogue/api/views.py
index 68626e6..34971c4 100644 (file)
--- a/src/catalogue/api/views.py
+++ b/src/catalogue/api/views.py
@@ -159,7 +159,7 @@ class Preview(ListAPIView):
     def get_queryset(self):
         qs = Book.objects.filter(preview=True)
         # FIXME: temporary workaround for a problem with iOS app; see #3954.
-        if 'Darwin' in self.request.META['HTTP_USER_AGENT'] and 'debug' not in self.request.GET:
+        if 'Darwin' in self.request.META.get('HTTP_USER_AGENT', '') and 'debug' not in self.request.GET:
             qs = qs.none()
         return qs