WifiManager: safeguard an error response (#37182)

safeguard

system/ui/lib/wifi_manager.py

@@ -661,7 +661,13 @@ class WifiManager:
 
     for active_conn in self._get_active_connections():
       conn_addr = DBusAddress(active_conn, bus_name=NM, interface=NM_ACTIVE_CONNECTION_IFACE)
-      props = self._router_main.send_and_get_reply(Properties(conn_addr).get_all()).body[0]
+      reply = self._router_main.send_and_get_reply(Properties(conn_addr).get_all())
+
+      if reply.header.message_type == MessageType.error:
+        cloudlog.warning(f"Failed to get active connection properties for {active_conn}: {reply}")
+        continue
+
+      props = reply.body[0]
 
       if props.get('Type', ('s', ''))[1] == '802-11-wireless':
         # IPv4 address