PanFlareActor throws error if activeAreas->RelativePanArea does not have debugArea value

First of all, thank you for your efforts & great package.
Following code throws a runtime exception if I do not include **debugArea** value. If I enter debugArea as true/false, it works as expected.

```
PanFlareActor(
width: 135.0,
height: size.height,
filename: 'filepath',
openAnimation: 'Open',
closeAnimation: 'close',
direction: ActorAdvancingDirection.RightToLeft,
threshold: 20.0,
reverseOnRelease: true,
completeOnThresholdReached: true,
activeAreas: [
RelativePanArea(
area: Rect.fromLTWH(0, 0.7, 1.0, 0.3),
),
],
),
```

Start by locating PanFlareActor and RelativePanArea, then reproduce the issue with the provided snippet while omitting debugArea. Trace how the active area is initialized and identify the expected behavior when debugArea is absent; done means the snippet runs without a runtime exception and explicit true/false values still work.

Written by the indexing model from the issue text.