[FIX] hw_drivers: Fix default value for iot_client on boot

If an IoT doesn't have a DB recorded, the IoT client can't have an
url.
So the Websocket can't parse a empty string and return a traceback.

With this commit we check if there are a DB else iot_client is None

closes odoo/odoo#150089

Signed-off-by: Yaroslav Soroko (yaso) <yaso@odoo.com>

addons/hw_drivers/main.py

@@ -96,7 +96,7 @@ class Manager(Thread):
             _logger.warning("An error happened when trying to get the HTTPS certificate: %s",
                             certificate_details)
 
-        iot_client = WebsocketClient(helpers.get_odoo_server_url())
+        iot_client = helpers.get_odoo_server_url() and WebsocketClient(helpers.get_odoo_server_url())
         # We first add the IoT Box to the connected DB because IoT handlers cannot be downloaded if
         # the identifier of the Box is not found in the DB. So add the Box to the DB.
         self.send_alldevices(iot_client)