fix get_active_users bug

userProfile.py

@@ -10,13 +10,14 @@ def get_active_users():
     sql = "select device_id from user_active_time " \
           "where active_time <= '{}' and active_time >= '{}'".format(now_end,now_start)
     device_id_df = con_sql(sql)
-    device_id_list = device_id_df[0].values.tolist()
-    # 对device_id 进行去重
-    device_id_list = list(set(device_id_list))
-
     if device_id_df.empty:
+        print("当下这一分钟没有活跃用户")
         return True,None
     else:
+        device_id_list = device_id_df[0].values.tolist()
+        # 对device_id 进行去重
+        device_id_list = list(set(device_id_list))
+        print("成功获取当下一分钟内活跃用户")
         return False,device_id_list