Exception handling for BT-Player control, if no player available

bt-audioparser/bt-audioparser.py

@@ -50,17 +50,19 @@ def on_property_changed(interface, changed, invalidated):
 
 
 def on_mqtt_ctrl(client, userdata, message):
-    if message.topic == config.MQTT_TOPIC + "/PLAY":
-        player_iface.Play()
-    elif message.topic == config.MQTT_TOPIC + "/PAUSE":
-        player_iface.Pause()
-    elif message.topic == config.MQTT_TOPIC + "/TRACK_PREV":
-        player_iface.Previous()
-    elif message.topic == config.MQTT_TOPIC + "/TRACK_NEXT":
-        player_iface.Next()
-    else:
-        logger.info(message.topic)
-
+    try:
+        if message.topic == config.MQTT_TOPIC + "/PLAY":
+            player_iface.Play()
+        elif message.topic == config.MQTT_TOPIC + "/PAUSE":
+            player_iface.Pause()
+        elif message.topic == config.MQTT_TOPIC + "/TRACK_PREV":
+            player_iface.Previous()
+        elif message.topic == config.MQTT_TOPIC + "/TRACK_NEXT":
+            player_iface.Next()
+        else:
+            logger.info(message.topic)
+    except AttributeError:
+        logger.warning("Player control impossible due to no player available.")
 
 if __name__ == "__main__":
     report.stdoutLoggingConfigure(((config.APP_NAME, config.LOGLVL), ), fmt=config.formatter)