Errors in `if` expressions go undetected

[Klaus Kämpf]

Well, turns out that #44 isn't really an improvement since false if-expressions are reported as failures.

So you can't distinguish between "if expression evaluates to false" and "if expression is syntactically wrong" in the logs.

The actual problem is in console.Run which reports a non-zero exit code as error and combines stdout+stderr.

Maybe console.Run should check for non-empty stderr instead ? 🤔
Or a separate console.If is needed ? 🤷🏻‍♂️