unhandled case where sunspec models dict is empty..

[davmoz]

[Logs] [2024-11-21T08:39:11.881Z] [web] INFO:server.devices.inverters.ModbusSunspec:Models: {}
[Logs] [2024-11-21T08:39:11.884Z] [web] ERROR:server.tasks.openDevicePerpetualTask:Exception opening a device: 'SunSpecModbusClientDeviceTCP' object has no attribute 'common''Traceback (most recent call last):\n File "/server/tasks/openDevicePerpetualTask.py", line 44, in execute\n if self.device.connect():\n ^^^^^^^^^^^^^^^^^^^^^\n File "/server/devices/Device.py", line 22, in connect\n return self._connect(**kwargs)\n ^^^^^^^^^^^^^^^^^^^^^^^\n File "/server/devices/inverters/ModbusSunspec.py", line 102, in _connect\n self.sn = self.client.common[0].SN.value\n ^^^^^^^^^^^^^^^^^^\n File "/usr/local/lib/python3.11/site-packages/sunspec2/device.py", line 725, in getattr\n raise AttributeError("'%s' object has no attribute '%s'" % (self.class.name, attr))\nAttributeError: 'SunSpecModbusClientDeviceTCP' object has no attribute 'common''