Dimming and power on/off broken in group panel

[Michał Sawicz]

I have a 2-gang ZigBee dimmer, which basically are two separate on/off + dimming things.

When grouped, trying to control the whole group at once fails with:

 I | JsonRpcTraffic: Incoming data: "{\"id\":116,\"method\":\"Devices.ExecuteAction\",\"params\":{\"actionTypeId\":\"{050bedd2-64a2-43d0-94a4-2149efedd0b5}\",\"deviceId\":\"{00000000-0000-0000-0000-000000000000}\",\"params\":[{\"paramTypeId\":\"050bedd2-64a2-43d0-94a4-2149efedd0b5\",\"value\":true}]},\"token\":\"DdGD/iNOo5GDrzzHAJaRotGj4WzGgccTDaEctDz0+Is=\"}\n"
 W | JsonRpc: JSON RPC parameter verification failed for method "Devices.ExecuteAction"
 W | JsonRpc: "Invalid Uuid: {00000000-0000-0000-0000-000000000000}" in "Devices.ExecuteAction, param deviceId."
 W | JsonRpc: Call params: {
    "actionTypeId": "{050bedd2-64a2-43d0-94a4-2149efedd0b5}",
    "deviceId": "{00000000-0000-0000-0000-000000000000}",
    "params": [
        {
            "paramTypeId": "050bedd2-64a2-43d0-94a4-2149efedd0b5",
            "value": true
        }
    ]
}

 I | JsonRpcTraffic: Sending data: "{\"error\":\"Invalid params: Invalid Uuid: {00000000-0000-0000-0000-000000000000} in Devices.ExecuteAction, param deviceId.\",\"id\":116,\"status\":\"error\"}"