fix test_alert

Author: yungwine

modules/alert_bot.py

@@ -187,6 +187,8 @@ def print_alerts(self, args):
         print_table(table)
 
     def test_alert(self, args):
+        if not self.inited:
+            self.init()
         self.send_message('Test alert')
 
     def check_db_usage(self):