[后端]修改后端公告GET接口，增加返回公告总条数，总页数

admin/views.py

@@ -11,4 +11,4 @@ class AdminTemplateView(APIView):
         try:
             return HttpResponse(open(path).read(), content_type="text/html")
         except IOError:
-            return HttpResponse(u"模板不存在", content_type="text/html")
+            raise Http404