Choice text functions called when choices aren't valid

This is kinda fair... but somewhat unexpected.

```
VAR bool = false

* {false} [{setBoolToTrue()}] -> gather
* {bool} [Should never be printed either] -> gather
- (gather)
-> END

=== function setBoolToTrue()
~ bool = true
This choice should never print
```

Ideally, the function "setBoolToTrue" wouldn't be called because the conditions on the option are false.