Return a 404 error for non-existent pages

pages/views.py

@@ -1,5 +1,5 @@
+from django.http import HttpResponseRedirect, Http404
 from django.utils.translation import get_language
-from django.http import HttpResponseRedirect
 from django.views import generic
 from django.urls import reverse
 from .models import Page, PageContent
@@ -16,7 +16,10 @@ class PageView(generic.DetailView):
     template_name = 'pages/page.html'
 
     def get_object(self):
-        return PageContent.objects.filter(
+        obj = PageContent.objects.filter(
             language=get_language(),
             page__slug=self.kwargs['slug']
         ).first()
+        if obj is None:
+            raise Http404('Page not found: %s' % self.kwargs['slug'])
+        return obj