udpate:增加iot消息properties和methods可能为空的情况 (#851)

* update:测试页面增加OTA地址

* update：兼容旧设备，无Client-Id的情况

* update:修复智控台下发配置布尔类型转换出错bug

* update:修复智控台下发配置字符类型转换出错bug

* udpate:增加iot消息properties和methods可能为空的情况

main/xiaozhi-server/core/handle/iotHandle.py

@@ -144,6 +144,7 @@ class IotDescriptor:
         self.methods = []
 
         # 根据描述创建属性
+        if properties is not None:
             for key, value in properties.items():
                 property_item = globals()[key] = {}
                 property_item["name"] = key
@@ -157,6 +158,7 @@ class IotDescriptor:
                 self.properties.append(property_item)
 
         # 根据描述创建方法
+        if methods is not None:
             for key, value in methods.items():
                 method = globals()[key] = {}
                 method["description"] = value["description"]