src/vs/workbench/contrib/debug/browser/variablesView.ts/VariablesDataSource/hasChildren
class VariablesDataSource:	hasChildren(element: IStackFrame | null | IExpression | IScope): boolean {
		if (!element) {
			return false;
		}
		if (isStackFrame(element)) {
			return true;
		}

		return element.hasChildren;
	}