404 error rather than 403 when media is not found

apps/member/views.py

@@ -4,7 +4,7 @@ from django.contrib.auth.mixins import LoginRequiredMixin
 from django.contrib.auth.models import AnonymousUser
 from django.core.exceptions import PermissionDenied
 from django.db.models import Q
-from django.http import FileResponse
+from django.http import FileResponse, Http404
 from django.shortcuts import redirect
 from django.urls import reverse_lazy
 from django.utils import timezone
@@ -188,7 +188,11 @@ class DocumentView(LoginRequiredMixin, View):
     """
 
     def get(self, request, *args, **kwargs):
-        doc = Document.objects.get(file=self.kwargs["file"])
+        try:
+            doc = Document.objects.get(file=self.kwargs["file"])
+        except Document.DoesNotExist:
+            raise Http404(_("No %(verbose_name)s found matching the query") %
+                          {'verbose_name': Document._meta.verbose_name})
 
         grant = request.user.admin