raise a 404 error if attachment cant be found

apps/jetpack/views.py

@@ -768,7 +768,8 @@ def package_remove_attachment(r, id_number, type_id, revision_number):
         return HttpResponseForbidden('You are not the author of this Package')
 
     uid = r.POST.get('uid', '').strip()
-    attachment = Attachment.objects.get(pk=uid, revisions=revision)
+    attachment = get_object_with_related_or_404(Attachment,
+                                                pk=uid, revisions=revision)
 
     if not attachment:
         log_msg = ('Attempt to remove a non existing attachment. attachment: '