Passing instructions fails when there are no instructions

[toth-istvan-zoltan]

Fix handling of missing vararg arguments when passing instructions to other fragments.

This function fails when it is called with no instructions passed:

@Adaptive
fun layoutExample(title: String, vararg instructions: AdaptiveInstruction, @Adaptive example: () -> Unit) : AdaptiveFragment {
    column(*instructions) {
    }
}

This one works:

@Adaptive
fun layoutExample(title: String, vararg instructions: AdaptiveInstruction = emptyArray(), @Adaptive example: () -> Unit) : AdaptiveFragment {
    column(*instructions) {
    }
}

[toth-istvan-zoltan]

When not present, state definition transform adds the emptyArray() default value.