anavi-miracle-controller-sw: Config HA discovery

Do not send MQTT discovery message to Home Assistant if the length
of of the LED strip is zero. This way you can display one of the
LEDs. For example: if LED1 length is set to 10 and LED2 lenght is
0 than only LED1 will be discovered by Home Assistant.

Signed-off-by: Leon Anavi <leon@anavi.org>

Author: leon-anavi

anavi-miracle-controller-sw/anavi-miracle-controller-sw.ino

@@ -1275,8 +1275,15 @@ bool publishLightDiscovery(int ledId)
 
 void publishDiscoveryState()
 {
-    publishLightDiscovery(1);
-    publishLightDiscovery(2);
+    if (0 < numberLed1)
+    {
+        publishLightDiscovery(1);
+    }
+
+    if (0 < numberLed2)
+    {
+        publishLightDiscovery(2);
+    }
 
     String homeAssistantTempScale = "°C";