Disable state reporting of unsupported elements

Some systems don't have vanes, which lead to unnecessary errors/warnings. There is probably a more elegant way of handling this.
 
```
[08:59:55][D][select:015]: 'Vane Position': Sending state 5 (index 5)
[08:59:55][E][select:018]: 'Horizontal Vane Position': invalid state for publish_state(): 
[08:59:55][W][mitsubishi_uart:180]: Vane in unknown horizontal position 0
```

Thank you!