X-Git-Url: https://git.mdrn.pl/wolnelektury.git/blobdiff_plain/1a407848c86505b6491a2d11a269782154fd8582..8952b9530d943655e552ea660c47e850123c5105:/src/catalogue/api/views.py

diff --git a/src/catalogue/api/views.py b/src/catalogue/api/views.py
index 68626e6d6..c70a73ed0 100644
--- a/src/catalogue/api/views.py
+++ b/src/catalogue/api/views.py
@@ -11,14 +11,14 @@ from rest_framework.response import Response
 from rest_framework import status
 from api.handlers import read_tags
 from api.utils import vary_on_auth
-from club.models import Membership
-from .helpers import books_after, order_books
-from . import serializers
 from catalogue.forms import BookImportForm
 from catalogue.models import Book, Collection, Tag, Fragment, BookMedia
 from catalogue.models.tag import prefetch_relations
+from club.models import Membership
 from club.permissions import IsClubMember
 from wolnelektury.utils import re_escape
+from .helpers import books_after, order_books
+from . import serializers
 
 
 book_tag_categories = ['author', 'epoch', 'kind', 'genre']
@@ -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