From 6f54e8c506e94085f58d7fb6fe2f6b3b607717fb Mon Sep 17 00:00:00 2001
From: lguohan <lguohan@gmail.com>
Date: Sun, 22 Mar 2020 10:16:59 -0700
Subject: [PATCH] Revert "return list for _get_optional_services() (#822)"
 (#848)

This reverts commit f1c79d553209ccdea1e64d76854cf3606461ccc3.
---
 config/main.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/config/main.py b/config/main.py
index 778fd429f410..820d4085e690 100755
--- a/config/main.py
+++ b/config/main.py
@@ -413,6 +413,8 @@ def _get_optional_services():
     config_db = ConfigDBConnector()
     config_db.connect()
     optional_services_dict = config_db.get_table('FEATURE')
+    if not optional_services_dict:
+        return None
     return optional_services_dict.keys()
 
 def _stop_services():